JS初级学习笔记（1）
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为了需要，近期开始学习JS相关知识，主要的方式是通过看视频以及查阅相关手册，并动手实践，亲手写出每个小案例，以下是相关代码（每个案例用分隔线隔开）。
<!DOCTYPE html><html><head><title>设置一个元素是否可见</title><meta charset="utf-8"></head><style type="text/css">.tips{width:370px;background:#CCC;display:none;}</style><script type="text/javascript">//定义一个函数function show_or_hide(){//通过id来获取一个元素var objl =document.getElementById("get_p");// 这种是行内样式的写法,形如：<p style="display:none;"></p>if(objl.style.display == 'block')objl.style.display = 'none';elseobjl.style.display = 'block';}</script><body><!-- 添加点击事件 --><input type="button" value="隐藏/显示" onclick="show_or_hide()" title="可以点击我一下"><p id="get_p" class="tips" >从前有座山，山上有座庙，庙里有个帅哥写代码</p></body></html><!-- *************************************************************************************--><!DOCTYPE html><html><head><title>鼠标移入移出事件</title><meta charset="utf-8"></head><style type="text/css">#get_input{background:yellow;}</style><script type="text/javascript">function over_bg_color(){var obj = document.getElementById('get_input');// 这种是行内样式的写法,形如：<p style="background:red;"></p>obj.style.background='red';}function out_bg_color(){var obj = document.getElementById('get_input');obj.style.background='yellow';}</script><body><!-- 添加鼠标移入移出事件 --><input id="get_input" type="button" value="隐藏/显示"onmouseover="over_bg_color()" onmouseout="out_bg_color()" ></body></html><!-- *************************************************************************************--><!DOCTYPE html><html><head><title>二级菜单</title><meta charset="utf-8"><style type="text/css">#nav{height:50px;background:red;margin:50px auto 0px;}a{float:left;width:250px;line-height:50px;text-align:center;color:#FFF;text-decoration:none;}#detailed{width:250px;height:200px;background:red;position:relative;border-top:2px solid yellow;display:none;left:0px;}</style><script type="text/javascript">function show_detailed(index){var obj = document.getElementById('detailed');// 设置元素可见obj.style.display='block';var move_left = 250*index-250;move_left = move_left+"px";//将结果转换成字符串obj.style.left =move_left;}function hide_detailed(){var obj = document.getElementById('detailed');obj.style.display='none';}</script></head><body><div id="nav"><!-- 这种直接在行内为元素添加事件不美观，可以写在JS里面 --><a href="#" onmouseover="show_detailed(1)"onmouseout="hide_detailed()"> 首页</a><a href="#" onmouseover="show_detailed(2)"onmouseout="hide_detailed()">家电</a><a href="#" onmouseover="show_detailed(3)"onmouseout="hide_detailed()">手机</a><a href="#" onmouseover="show_detailed(4)"onmouseout="hide_detailed()">付款方式</a><a href="#" onmouseover="show_detailed(5)"onmouseout="hide_detailed()">客服</a></div><div id="detailed"><a href="#">一</a><a href="#">二</a><a href="#">三</a><a href="#">四</a></div></body></html><!-- *************************************************************************************--><!DOCTYPE html><html><head><title>改变物体外观</title><meta charset="utf-8"><style type="text/css">body{padding:200px;}#change_box{width:300px;height:300px;background:#CCC;}</style><script type="text/javascript">function change_color(want_color){var obj = document.getElementById('change_box');obj.style.background = want_color;}function change_size(width_size,height_size){var obj = document.getElementById('change_box');obj.style.width = width_size+'px';obj.style.height = height_size+'px';}</script></head><body><input type="button" value="变黄" onclick="change_color('yellow')"><input type="button" value="变绿" onclick="change_color('green')"><input type="button" value="变红" onclick="change_color('red')"><input type="button" value="变大" onclick="change_size(500,600)"><input type="button" value="变小" onclick="change_size(100,200)"><div id="change_box"></div></body></html><!-- *************************************************************************************--><!DOCTYPE html><html><head><title>JS为元素添加事件</title><meta ><meta charset="utf-8"></head><body><input id="btn1" type="button" value="按钮" onclick="abc()" /><script type="text/javascript">// 下面这个获取元素的代码要写在该目标 元素的下面// 因为程序是从上到下执行的，不然的话会报错var obtn = document.getElementById('btn1');function abc(){alert('这是一个弹窗');//可以是单引号，也可以是双引号}//obtn.onclick=abc;//这种是直接在JS里面为元素添加事件的写法//这里函数不能加括号</script></body></html><!-- *************************************************************************************--><!DOCTYPE html><html><head><title>全选反选按钮</title><meta charset="utf-8"><style type="text/css">body{padding:150px;background:#CCC;}</style></head><body><input type="button" id="btn_all" value="全选"></input><input type="button" id="btn_reversed" value="反选"></input><input type="button" id="btn_no" value="都不选"></input><div id="ware"><input type="checkbox" ></input><input type="checkbox" ></input><input type="checkbox" ></input><input type="checkbox" ></input><input type="checkbox" ></input><input type="checkbox" ></input></div></body><script type="text/javascript">function choose_all(){var obj = document.getElementById('ware');//从一个目标元素中再获取元素//下面是通过html元素名字来获取，结果是数组var ch_b = obj.getElementsByTagName('input');for(var i=0; i <= ch_b.length; i++)//下面的语句类似于：<input type="checkbox" checked="true"></input>ch_b[i].checked = true;}function choose_no(){var obj = document.getElementById('ware');var ch_b = obj.getElementsByTagName('input');for(var i=0; i <= ch_b.length; i++)ch_b[i].checked = false;}function choose_reversed(){var obj = document.getElementById('ware');var ch_b = obj.getElementsByTagName('input');for(var i=0; i <= ch_b.length; i++)ch_b[i].checked = ( ch_b[i].checked == true )? false:true;}//我并没有直接document.getElementById('');这样获取元素//按理说要先获取元素，再来操作，不然是不行的，//我也不知道为什么我的这段代码却可以btn_all.onclick = choose_all;btn_no.onclick = choose_no;btn_reversed.onclick = choose_reversed;</script></html><!-- *************************************************************************************--><!DOCTYPE html><html><head><title>选项卡</title><meta charset="utf-8"><style type="text/css">body{padding:150px;}#xuan_xiang_ka{width:208px;height:350px;}.title{height:50px;}.title input{height:50px;width:50px;float:left;border:1px solid #CCC;margin-left:2px;}.active{background:#5CB85C;}#content_box{background:yellow;}#content_box div{display:none;}/*设置子元素不可见*/</style></head><body><div id="xuan_xiang_ka"><div class="title"><input class="active" type="button" value="新闻1"></input><input type="button" value="新闻2"></input><input type="button" value="新闻3"></input><input type="button" value="新闻4"></input></div><div id="content_box" ><div style="display:block;">从前有座山1</div><div>从前有座山2</div><div>从前有座山3</div><div>从前有座山4</div></div></div></body><script type="text/javascript">var an_niu = document.getElementsByTagName('input');var temp =document.getElementById('content_box');var wen_zhang =temp.getElementsByTagName('div');for(var i=0; i < an_niu.length; i++){an_niu[i].index = i;//为每个按钮添加序号an_niu[i].onclick = function (){for(var j=0; j < an_niu.length; j++){an_niu[j].className = '';//清除类wen_zhang[j].style.display = 'none';}this.className = 'active';//当前按钮添加活动类wen_zhang[this.index].style.display ='block';//当前选项卡可见//思路：在点击一个选项卡之前，把其他的选项卡都影藏，并清除类//之后再为当前的选项卡添加属性}}</script></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>innerHTML练习</title> <meta charset="utf-8"> <style type="text/css"> body{padding:50px;} div{border:1px solid red;width:260px;height:200px;padding:20px;} </style> </head> <body> <input id="text1" type="text"></input> <input id="btn1" type="button" value="设置文字"></input> <div id="div1"> 从前有座山 </div> </body> <script type="text/javascript"> var btn1 = document.getElementById('btn1'); var text1 = document.getElementById('text1'); var div1 = document.getElementById('div1'); btn1.onclick = function () { // 让div里面的文字是text里面的文字 div1.innerHTML = text1.value; } </script></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>月历选项卡</title> <meta charset="utf-8"> <style type="text/css"> *{margin:0px;padding:0px;} .ware{background:yellow;padding:15px 0px 15px 15px;width:285px;margin:100px auto;overflow:hidden;} .month{overflow:hidden;} span{float:left;width:80px;line-height:80px;text-align:center;font-size:16px;color:#FFF;font-weight:bold; margin-right:15px;margin-bottom:15px; background:#999;} .tips{background:red;clear:both;width:240px;padding:15px;font-weight:bold;color:#FFF;} .active{background:#FFF;color:black;} </style> </head> <body> <div class="ware"> <div class="month"> <span class="active">1</span><span>2</span><span>3</span> <span>4</span><span>5</span><span>6</span> <span>7</span><span>8</span><span>9</span> <span>10</span><span>11</span><span>12</span> </div> <div id="setText" class="tips"> </div> </div> </body> <script type="text/javascript"> var obj_month = document.getElementsByTagName('span'); var objTips = document.getElementById('setText'); var arr =[ '这个月有元旦', '我们一起过年吧', '这个月有38妇女节', '4月分有什么节日呢？', '哈哈劳动节快到了', '可惜儿童节不属于我们', '貌似有建党节吧', '这个月有建军节吧么么哒', '教师节到了，给老师一份祝福吧', '一起看阅兵式吧', '光棍节到了，有木有很伤心～', '圣诞节不是中国的～' ]; // 默认显示第一个月 objTips.innerHTML = '<p>1月活动'+'</p>'+arr[0]; for(var i=0; i < obj_month.length; i++) { obj_month[i].index = i; obj_month[i].onmousemove = function () { for(var j=0; j < obj_month.length; j++) obj_month[j].className = ''; this.className = 'active'; objTips.innerHTML = '<p>'+(this.index+1)+'月活动'+'</p>'+arr[this.index]; } } </script></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>数组遍历</title> <meta charset="utf-8"> </head> <body> </body> <script type="text/javascript"> var colorS =['yellow','blue','green','pink','black']; for( var x in colorS)//x 是下标 { alert(colorS[x]); //alert(x); } </script></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>属性用变量代替</title> <meta charset="utf-8"> <style type="text/css"> body{padding:400px; padding-top:200px;} #box{width:300px;height:300px;background:yellow;} </style> </head> <body> <div id="box"></div> <input type="button" value="点击我一下下～" id="btn"></input> </body> <script type="text/javascript"> var value = 'background'; var oBtn = document.getElementById('btn'); var oBox = document.getElementById('box'); oBtn.onclick = function () { oBox.style[value] = 'red'; //等同于 oBox.style.background = 'red'; } </script></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>根据参数个数实现相应功能</title> <meta charset="utf-8"> </head> <body> <div id="J_box" style="width:300px;height:240px;background:#CCC;margin:100px;"></div> </body> <script type="text/javascript"> var oBox = document.getElementById('J_box'); function css () { if(arguments.length == 2) alert(arguments[0].style[arguments[1]]); if(arguments.length == 3) arguments[0].style[arguments[1]] = arguments[2]; } css(oBox,'width','800px'); </script></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>获取非行间样式</title> <meta charset="utf-8"> <style type="text/css"> #J_box{width:300px;height:240px;background:#CCC;margin:100px;} </style> </head> <body> <div id="J_box"></div> </body> <script type="text/javascript"> var oBox = document.getElementById('J_box'); if(oBox.currentStyle) alert(oBox.currentStyle.width);//IE else alert(getComputedStyle(oBox,false).width);//FF //采用变量的写法 alert(getComputedStyle(oBox , false)['width']); </script></html> <script type="text/javascript">// 函数封装// function getStyle(obj,name)// {// if( obj.currentStyle)// return obj.currentStyle[name];//obj.currentStyle.width;// else// return getComputedStyle(obj,false)[name];//getComputedStyle(obj,false).width;// } </script><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>数组的基本操作</title> <meta charset="utf-8"> </head> <body> </body> <script type="text/javascript"> var arr = [1,3,5,7,9,10]; var add = [100,200,300,400,500]; //arr.push(6);//尾部追加一个元素 //arr.pop();//尾部删除一个元素 //arr.unshift('lijun');//头部追加元素 //arr.shift();//头部删除一个 //arr.splice(3,2)//删除元素 起点 长度 从0开始算 //arr.splice(3,0);//从下标3开始，依次删除0个元素 //arr.splice(3,2,6,7);//从下标3开始，依次删除2个，然后添加6,7元素 //arr.concat(add);//两个字符串连接，但是两个数组并没有变 //alert(arr.join('***'));//记得加引号，相邻数组元素间添加分隔符,不会真的改变数组 /*var temp = ['aaa','xxx','dddd','ssss','eeee','bbbbb']; alert(temp.sort());*/ //数组排序，只能排字符串 /*var temp =[6,7,45,8,6,10,7,8,45,1,14,89,39]; alert(temp.sort( function(num1,num2) { return num1 - num2; } ));*/ //数组排序，排数字 // 数组排序的时候要根据实际情况改动，例如传递的是li或者其他元素， // 要把最后在比较的是数值比较 alert(arr); </script></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>定时器的使用</title> <meta charset="utf-8"> </head> <body> <input id="kai" type="button" value="开启"></input> <input id="guan" type="button" value="关闭"></input> </body> <script type="text/javascript"> //setInterval 间隔 //setTimeout 延时 var okai = document.getElementById('kai'); var oguan = document.getElementById('guan'); function say() { alert('您好~'); } okai.onclick = function () { temp = setInterval(say,2500);//函数只写名字不加括号，变量也是全局的，不然等下下面不能关闭 } oguan.onclick = function() { clearInterval(temp);//这个被关闭的变量是全局的，不要定义成局部的。 } </script></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>数字时钟，需要相关图片辅助</title> <meta charset="utf-8"> <style type="text/css"> body{background:#555;} .timeBox{width:300px;margin:200px auto;} span{font-size: 50px;} </style> </head> <body> <div class="timeBox"> <img src="./images/0.png"><img src="./images/0.png"> <span>:</span> <img src="./images/0.png"><img src="./images/0.png"> <span>:</span> <img src="./images/0.png"><img src="./images/0.png"> </div> </body> <script type="text/javascript"> function setNumberToStr(number) { // 把数字弄成两位数的，并转换成字符串 if(number < 10) return '0' + number; else return '' + number; } // 获取系统时间 function realTime() { var oDate = new Date(); var hour = oDate.getHours();//获取小时 var minute = oDate.getMinutes();//获取分钟 var second = oDate.getSeconds();//获取秒 return setNumberToStr(hour) + setNumberToStr(minute) + setNumberToStr(second); } function setTime() { var otime = document.getElementsByTagName('img'); var howTime = realTime();//当前时间 转换成字符串格式后存入数组 for(var i=0; i < otime.length; i++) otime[i].src = './images/'+howTime[i]+'.png'; } setTime();//这个是为了解决刷新的时候全部显示０的情况，也可以把一秒设置更小 setInterval(setTime,1000); </script></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>字符串查找、系统时间</title> <meta charset="utf-8"> </head> <body> </body> <script type="text/javascript"> var times = "我是一个大帅哥"; alert(times.charAt(0));//用来查找字符串中某个坐标中的内容 // 不能是数组，只能是字符串 var odate = new Date(); //alert(odate.getFullYear()); //alert(odate.getMonth()+1);//月份少1 // alert(odate.getDate());//星期几 //alert(odate.getHours());//获取小时 //alert(odate.getMinutes());//获取分钟 //alert(odate.getSeconds());//获取秒 //alert(odate.getDay());//周日是０ </script></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>孩子节点</title> <meta charset="utf-8"> <script type="text/javascript"> window.onload = function() { var oUl = document.getElementById('ul1'); //alert(oUl.childNodes.length);//节点的个数，会包括文本节点。 //for(var i=0; i < oUl.childNodes.length; i++) //alert(oUl.childNodes[i].nodeType);//节点的类型 文本节点->3 元素节点->1 //alert(oUl.children.length);节点的个数，不包括文本节点。 for(var i=0; i < oUl.children.length; i++) oUl.children[i].style.background = 'red'; } </script> </head> <body> <ul id="ul1"> <li></li> <li></li> </ul> </body></html><!-- DOM节点 childNodes children nodeType parentNode offsetParent--><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>父节点</title> <meta charset="utf-8"> <style type="text/css"> body{padding-left:400px;padding-top:200px;} a{margin-left:100px;} </style> <script type="text/javascript"> window.onload = function() { //var oUl = document.getElementById('ul1'); //alert(oUl.children[i].parentNode);//错误的写法////////////////////////////// //var oSoon = document.getElementById('soon'); //alert(oSoon.parentNode);//获取某个元素的父节点 var oA = document.getElementsByTagName('a'); for(var i=0; i < oA.length; i++) { oA[i].onclick = function() { this.parentNode.style.display = 'none'; //a的父亲就是li，让li隐藏 } } } </script> </head> <body> <ul id="ul1"> <li>从前有座山 <a href="#">隐藏</a> </li> <li>山上有座庙 <a href="#">隐藏</a> </li> <li>庙里有个老和尚 <a href="#">隐藏</a> </li> <li>老和尚对着小和尚说 <a href="#">隐藏</a> </li> <li>我们这里有座山 <a href="#">隐藏</a> </li> <li>里面有个老和尚 <a href="#">隐藏</a> </li> </ul> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>父级元素</title> <meta charset="utf-8"> <script type="text/javascript"> window.onload = function() { // 通过html标签来获取元素，返回的是数组， //可以在后面加坐标指定要获取某个元素 var demo1 = document.getElementsByTagName('ul'); var demo2 = document.getElementsByTagName('li'); alert(demo2[2].offsetParent);//父级元素（有定位属性的父级元素） } </script> </head> <body> <ul> <li>从前有座山</li> <li>山上有座庙</li> <li>庙里有个老和尚</li> <li>老和尚对着小和尚说</li> <li>我们这里有座山</li> <li>里面有个老和尚</li> </ul> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>孩子节点</title> <meta charset="utf-8"> <style type="text/css"> </style> <script type="text/javascript"> window.onload = function() { // 这是比较便捷的写法，让某些类拥有一些样式 // var oLi = document.getElementsByTagName('li'); // for(var i=0; i < oLi.length; i++) // if(oLi[i].className == 'bgRed') // oLi[i].style.background = 'red'; var oul = document.getElementsByTagName('ul')[0]; for(var i=0; i < oul.childNodes.length; i++) if(oul.childNodes[i].className == 'bgRed') oul.childNodes[i].style.background = 'red'; } </script> </head> <body> <ul> <li class="bgRed">从前有座山</li> <li>山上有座庙</li> <li>庙里有个老和尚</li> <li class="bgRed">老和尚对着小和尚说 </li> <li>我们这里有座山</li> <li class="bgRed">里面有个老和尚</li> </ul> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>代码块封装思想</title> <meta charset="utf-8"> <script type="text/javascript"> function getByClass(oParent,oClass) { var oReturn = [];//存放结果 // 获取该元素下面的所有元素 var oElem = oParent.getElementsByTagName('*'); for(var i=0; i < oElem.length; i++) if(oElem[i].className == oClass) oReturn.push(oElem[i]); return oReturn; } window.onload = function() { var oul = document.getElementsByTagName('ul')[0]; //0搜集的结果都放在这里 var oChange = getByClass(oul,'bgRed'); for(var i=0; i <oChange.length; i++) oChange[i].style.background = 'red'; } </script> </head> <body> <ul> <li class="bgRed">从前有座山</li> <li>山上有座庙</li> <li>庙里有个老和尚</li> <li class="bgRed">老和尚对着小和尚说 </li> <li>我们这里有座山</li> <li class="bgRed">里面有个老和尚</li> </ul> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>DOM 方式操作元素属性</title> <meta charset="utf-8"> <script type="text/javascript"> window.onload = function() { var oa =document.getElementsByTagName('a')[0]; // 获取：getAttribute(名称) // 设置：setAttribute(名称，值) // 删除： removeAttribute(名称) oa.setAttribute('title','哈哈~'); } </script> </head> <body> <a href="#">我很帅</a> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>添加节点</title> <meta charset=" utf-8"> <script type="text/javascript"> window.onload = function() { var oBtn = document.getElementsByTagName('input')[1]; var oTxt = document.getElementsByTagName('input')[0]; var oUl = document.getElementsByTagName('ul')[0]; oBtn.onclick = function() { var oLi = document.createElement('li');//创建一个元素 var inBeforeLi = document.getElementsByTagName('li')[0]; if(inBeforeLi) oUl.insertBefore(oLi,inBeforeLi)//在某个元素之前追加 else oUl.appendChild(oLi);//末尾追加 oLi.innerHTML = oTxt.value; } } </script> </head> <body> <input type="text"></input> <input type="button" value="创建li"></input> <ul> </ul> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>删除节点</title> <meta charset=" utf-8"> <script type="text/javascript"> window.onload = function() { var oA = document.getElementsByTagName('a'); var oUl = document.getElementsByTagName('ul')[0]; for(var i=0; i < oA.length; i++) oA[i].onclick = function() { oUl.removeChild(this.parentNode); } } </script> </head> <body> <ul> <li>111<a href="#">删除</a></li> <li>222<a href="#">删除</a></li> <li>333<a href="#">删除</a></li> <li>444<a href="#">删除</a></li> <li>555<a href="#">删除</a></li> <li>666<a href="#">删除</a></li> <li>777<a href="#">删除</a></li> </ul> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>节点碎片</title> <meta charset=" utf-8"> <script type="text/javascript"> window.onload = function() { // 创建一个节点碎片 var temp = document.createDocumentFragment(); for(var i=0; i<25; i++) { var oLi = document.createElement('li'); // 向节点碎片中添加孩子节点 temp.appendChild(oLi); } // 直接给要添加节点的元素添加 已经存在的碎片 document.getElementsByTagName('ul')[0].appendChild(temp); } </script> </head> <body> <ul> </ul> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>表格基本属性</title> <meta charset=" utf-8"> <script type="text/javascript"> window.onload = function() { var oTab = document.getElementsByTagName('table')[0]; // alert(oTab.tBodies[0].rows[0].cells[1].innerHTML); var oldColor = '';//记录原来的颜色 // 表格隔行换色，鼠标移入换色，移出换回原来的颜色 for(var i=0; i < oTab.tBodies[0].rows.length; i++) { if( i % 2 )//奇偶行数 oTab.tBodies[0].rows[i].style.background = '#CCC'; else oTab.tBodies[0].rows[i].style.background = '#555'; oTab.tBodies[0].rows[i].onmouseover = function() { oldColor = this.style.background; this.style.background = 'green'; } oTab.tBodies[0].rows[i].onmouseout = function() { this.style.background = oldColor; } } } </script> </head> <body> <table border="1px" width="500px"> <thead> <td>ID</td ><td>姓名</td><td>年龄</td> </thead> <tbody> <tr> <td>1</td><td>李俊</td><td>18</td> </tr> <tr> <td>2</td><td>李白</td><td>96</td> </tr> <tr> <td>3</td><td>小明</td><td>17</td> </tr> <tr> <td>4</td><td>李俊</td><td>18</td> </tr> <tr> <td>5</td> <td>李白</td><td>96</td> </tr> <tr> <td>6</td><td>小明</td><td>17</td> </tr> </tbody> </table> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>表格自动增加行数</title> <meta charset=" utf-8"> <script type="text/javascript"> window.onload = function() { // 直接读取某行某列的值 // alert(oTab.tBodies[0].rows[0].cells[1].innerHTML); var oTab = document.getElementsByTagName('table')[0]; var oname = document.getElementsByTagName('input')[0]; var oage = document.getElementsByTagName('input')[1]; var obtn = document.getElementsByTagName('input')[2]; var id = oTab.tBodies[0].rows.length; obtn.onclick = function() { // 创建1个行 var oTr = document.createElement('tr'); // 创建第1个列 var oTd_1 = document.createElement('td'); oTd_1.innerHTML = ++id; // 添加到行里面 oTr.appendChild(oTd_1); //创建第2个列 var oTd_2 = document.createElement('td'); oTd_2.innerHTML = oname.value; oTr.appendChild(oTd_2); //创建第3个列 var oTd_3 = document.createElement('td'); oTd_3.innerHTML = oage.value; oTr.appendChild(oTd_3); // 添加一行行 oTab.appendChild(oTr); } } </script> </head> <body style="padding-left:400px;padding-top:100px;"> 姓名：<input type="text"></input> 年龄：<input type="text"></input> <input type="button" value="添加"></input> <table border="1px" width="500px"> <thead> <td>ID</td ><td>姓名</td><td>年龄</td> </thead> <tbody> <tr> <td>1</td><td>李俊</td><td>18</td> </tr> <tr> <td>2</td><td>李白</td><td>96</td> </tr> <tr> <td>3</td><td>小明</td><td>17</td> </tr> </tbody> </table> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>表格自动删除单元格</title> <meta charset=" utf-8"> <script type="text/javascript"> window.onload = function() { var oTab = document.getElementsByTagName('table')[0]; // 这个注释是在为表格添加行的时候，添加删除操作单元格的时候的代码 // 貌似通过JS添加的单元格并不会有点击事件 // var oTd_4 = document.createElement('td'); // oTd_4.innerHTML = '<a href="#">删除</a>'; // oTr.appendChild(oTd_4); // oTab.appendChild(oTr); var oA = oTab.getElementsByTagName('a'); for(var i=0; i < oA.length; i++) { oA[i].onclick = function() { oTab.tBodies[0].removeChild(this.parentNode.parentNode); } } } </script> </head> <body style="padding-left:400px;padding-top:100px;"> <table border="1px" width="500px"> <thead> <td>ID</td ><td>姓名</td><td>年龄</td><td>编辑</td> </thead> <tbody> <tr> <td>1</td><td>李俊</td><td>18</td><td><a href="#">删除</a></td> </tr> <tr> <td>2</td><td>李白</td><td>96</td><td><a href="#">删除</a></td> </tr> <tr> <td>3</td><td>小明</td><td>17</td><td><a href="#">删除</a></td> </tr> </tbody> </table> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>表格搜索</title> <meta charset=" utf-8"> <script type="text/javascript"> window.onload = function() { var oTab = document.getElementsByTagName('table')[0]; var obtn = document.getElementsByTagName('input')[1]; var oname = document.getElementsByTagName('input')[0]; obtn.onclick = function() { for(var i=0; i< oTab.tBodies[0].rows.length; i++) { // 输入要搜索的名字，必须完全一样才能匹配 if(oname.value == oTab.tBodies[0].rows[i].cells[1].innerHTML) oTab.tBodies[0].rows[i].style.background = 'yellow'; else oTab.tBodies[0].rows[i].style.background = ''; } } //忽略大小写搜索 // obtn.onclick = function() // { // for(var i=0; i< oTab.tBodies[0].rows.length; i++) // { // var sTxt = oname.value; // var sTab = oTab.tBodies[0].rows[i].cells[1].innerHTML; // if( sTxt.toLowerCase() == sTab.toLowerCase() ) // oTab.tBodies[0].rows[i].style.background = 'yellow'; // else // oTab.tBodies[0].rows[i].style.background = ''; // } // } // 单个关键字模糊搜索 // obtn.onclick = function() // { // for(var i=0; i < oTab.tBodies[0].rows.length; i++) // { // var oTabName = oTab.tBodies[0].rows[i].cells[1].innerHTML; // if( oTabName.search(oname.value) != -1) // oTab.tBodies[0].rows[i].style.background = 'blue'; // else // oTab.tBodies[0].rows[i].style.background = 'red'; // } // } // 多关键字模糊搜索 // obtn.onclick = function() // { // for(var i=0; i < oTab.tBodies[0].rows.length; i++) // { // var oTabName = oTab.tBodies[0].rows[i].cells[1].innerHTML; // var arr = oname.value.split(' ');//用空格把字符串分割 // oTab.tBodies[0].rows[i].style.background = '';//不要写在下面的if else中 // for(var j=0; j < arr.length; j++) // { // if( oTabName.search(arr[j]) != -1 ) // oTab.tBodies[0].rows[i].style.background = 'blue'; // } // } // } } </script> </head> <body style="padding-left:400px;padding-top:100px;"> 姓名：<input type="text"></input> <input type="button" value="搜索"></input> <table border="1px" width="500px"> <thead> <td>ID</td ><td>姓名</td><td>年龄</td> </thead> <tbody> <tr> <td>1</td><td>李俊</td><td>18</td> </tr> <tr> <td>2</td><td>李白</td><td>96</td> </tr> <tr> <td>3</td><td>小明</td><td>17</td> </tr> </tbody> </table> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>字符串查找</title> <meta charset=" utf-8"> <script type="text/javascript"> var str = 'asdfghjkl'; alert(str.search('kl'));//查找这个k在字符串中的第几个位置。7 没有-1 </script> </head> <body> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>添加孩子节点，会先删除原来所在的位置</title> <meta charset=" utf-8"> <style type="text/css"> ul{background:yellow;margin-bottom:20px;} </style> <script type="text/javascript"> window.onload = function() { var oBtn = document.getElementsByTagName('input')[0]; var oUl1 = document.getElementsByTagName('ul')[0]; var oUl2 = document.getElementsByTagName('ul')[1]; oBtn.onclick = function() { //var temp = oUl1.getElementsByTagName('li')[0]; var temp = oUl1.children[0]; oUl2.appendChild(temp);//这个是在一个元素添加孩子节点。 //oUl1.removeChild(temp);//这步骤可以省略，上面那个代码会先删除再添加。 } } </script> </head> <body style="padding-left:400px;padding-top:100px;"> <ul> <li>1</li><li>2</li><li>3</li> <li>4</li><li>5</li><li>6</li> <li>7</li><li>8</li><li>9</li> </ul> <ul></ul> <input type="button" value="移动"></input> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>列表排序</title> <meta charset=" utf-8"> <style type="text/css"> ul{background:yellow;margin-bottom:20px;} </style> <script type="text/javascript"> window.onload = function() { var oBtn = document.getElementsByTagName('input')[0]; var oLi = document.getElementsByTagName('ul')[0].children; var arr = []; oBtn.onclick = function() { for(var i=0; i < oLi.length; i++) arr[i] = oLi[i]; //alert(arr[0] === oLi[0]); arr.sort(function(li1,li2){return parseInt(li1.innerHTML) - parseInt(li2.innerHTML);}); for(var i=0; i < arr.length; i++) document.getElementsByTagName('ul')[0].appendChild(arr[i]); // 原本以为排序好后列表的长度是原来的两倍 // 但是不是，估计是添加孩子节点的时候，就把原来的节点给删除了。 } } </script> </head> <body style="padding-left:400px;padding-top:100px;"> <input type="button" value="排序"></input> <ul> <li>99</li> <li>48</li> <li>25</li> <li>97</li> <li>3</li> <li>38</li> <li>26</li> <li>49</li> </ul> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>表格排序</title> <meta charset=" utf-8"> <script type="text/javascript"> window.onload = function() { var oBtn = document.getElementsByTagName('input')[0]; var oTab = document.getElementsByTagName('table')[0]; oBtn.onclick = function () { var arr = []; for(var i=0; i< oTab.tBodies[0].rows.length; i++) arr[i] = oTab.tBodies[0].rows[i];//把表格的每行存入一个数组 arr.sort(function (tr1,tr2) {return parseInt(tr1.cells[0].innerHTML) - parseInt(tr2.cells[0].innerHTML);}); for(var i=0; i < arr.length; i++) oTab.tBodies[0].appendChild(arr[i]);//把排序好的数组添加的表格中 } } </script> </head> <body style="padding-left:400px;padding-top:100px;"> <input type="button" value="排序"></input> <table border="1px" width="500px"> <thead> <td>ID</td><td>姓名</td><td>年龄</td> </thead> <tbody> <tr> <td>1</td><td>李俊</td><td>18</td> </tr> <tr> <td>7</td><td>张三</td><td>16</td> </tr> <tr> <td>3</td><td>王五</td><td>25</td> </tr> <tr> <td>6</td><td>马云</td><td>17</td> </tr> <tr> <td>2</td><td>小三</td><td>9</td> </tr> <tr> <td>5</td><td>小芳</td><td>36</td> </tr> <tr> <td>4</td><td>君君</td><td>14</td> </tr> </tbody> </table> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>定时器的使用</title> <meta charset=" utf-8"> <style type="text/css"> div{width:200px;height:150px;background:yellow;position:absolute;} } </style> <script type="text/javascript"> window.onload = function() { function Move() { document.getElementsByTagName('div')[0].style.left = document.getElementsByTagName('div')[0].offsetLeft + 10 + 'px'; } setInterval(Move,30); } </script> </head> <body> <div></div> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>物体的运动</title> <meta charset=" utf-8"> <style type="text/css"> body{margin:0px;padding:0px;} div{width:200px;height:150px;background:yellow;position:absolute;} } </style> <script type="text/javascript"> window.onload = function() { var timer = null; var oBtn = document.getElementsByTagName('input')[0]; oBtn.onclick = function () { clearInterval(timer);//保证只有一个定时器被打开 timer = setInterval(Move,30); } function Move() { var oDiv = document.getElementsByTagName('div')[0]; if(oDiv.offsetLeft == 600)//这两个语句不能调换顺序，不然会有偏差 clearInterval(timer); else oDiv.style.left = oDiv.offsetLeft + 10 + 'px'; //现在是因为有if，两个语句只会执行一个，可以换顺序 } //在开始运动时，关闭已经存在的定时器 //把运动和停止隔开（if else） } </script> </head> <body> <input type="button" value="动起来~"></input> <div></div> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>无缝滚动 -By小小俊</title> <meta charset="utf-8"> <style type="text/css"> *{margin:0px;padding:0px;} button{margin-top:180px;margin-left:400px;} div{margin:20px auto;width:730px;height:233px; position:relative;background:yellow; box-shadow: 20px 20px 3px #CCC;overflow:hidden; border:2px solid #CCC;border-radius:25px; } div ul{background:red;width:1480px;height:233px;position:absolute; } div ul li{float:left;list-style:none;margin-right:10px;} </style> <script type="text/javascript"> var speed = 0; var timer = null; window.onload = function() { var leftBtn = document.getElementsByTagName('button')[0];//左边的按钮 var rightBtn = document.getElementsByTagName('button')[1];//右边的按钮 var oUl = document.getElementsByTagName('ul')[0];//装图片的容器 oUl.innerHTML = oUl.innerHTML + oUl.innerHTML; timer = setInterval(Move,30);//貌似点击按钮的时候这个定时器没有被关闭，导致叠加 leftBtn.onclick = function(){speed = -5;startMove();} rightBtn.onclick = function(){speed = 5;startMove();} oUl.onmouseover = function(){clearInterval(timer);} oUl.onmouseout = function(){timer = setInterval(Move,30);} function Move() { oUl.style.left = oUl.offsetLeft + speed + 'px'; if( oUl.offsetLeft < -740)//往左边滚动的时候 oUl.style.left = '0px'; else if( oUl.offsetLeft > 0)//往右边滚动的时候 oUl.style.left = '-740px'; } function startMove() { clearInterval(timer);//避免定时器叠加 timer = setInterval(Move,30); } } </script> </head> <body> <button>点击向左边滚动、么么哒</button> <button style="margin-left:280px">点击向右边滚动、么么哒</button> <div> <ul> <li><img src="./1.jpg"></li> <li><img src="./2.jpg"></li> <li><img src="./3.jpg"></li> <li><img src="./4.jpg"></li> </ul> </div> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>分享按钮</title> <meta charset=" utf-8"> <style type="text/css"> div{width:150px;height:200px;position:absolute;background:yellow;left:-150px;} span{width:20px;height:60px;line-height:20px;position:absolute;right:-20px; top:70px;background:pink;} </style> <script type="text/javascript"> var timer = null;var Speed = 0;var Target = 0;//定时器、速度、目标 window.onload = function() { var oDiv = document.getElementsByTagName('div')[0]; function move(target,speed) { clearInterval(timer); timer = setInterval(function(){ if(oDiv.offsetLeft == target) clearInterval(timer); else oDiv.style.left = oDiv.offsetLeft + speed + 'px'; },30); } oDiv.onmouseover = function () { move(0,5); // clearInterval(timer); // timer = setInterval(function(){ // if(oDiv.offsetLeft == 0) // clearInterval(timer); // else // oDiv.style.left = oDiv.offsetLeft + 5 + 'px'; // },30); } oDiv.onmouseout = function () { move(-150,-5); // clearInterval(timer); // timer = setInterval(function(){ // if(oDiv.offsetLeft == -150) // clearInterval(timer); // else // oDiv.style.left = oDiv.offsetLeft - 5 + 'px'; // },30); } } </script> </head> <body> <div> <span>分享到</span> </div> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>淡入淡出</title> <meta charset="utf-8"> <style type="text/css"> div{filter:alpha(opacity:10);opacity:0.1;width:300px;height:300px;background:red;} </style> <script type="text/javascript"> var timer = null; var alpha = 10; window.onload = function() { var oDiv = document.getElementsByTagName('div')[0]; oDiv.onmouseover = function() { move(100); } oDiv.onmouseout = function() { move(10); } function move(target) { clearInterval(timer); timer = setInterval(function(){ if(alpha < target) speed = 4; else speed = -4; if(alpha == target) clearInterval(timer); else alpha += speed; oDiv.style.filter = 'alpha(opacity:'+alpha+')'; oDiv.style.opacity = alpha/100; },30); } } </script> </head> <body> <div> <!-- <img src="./1.jpg"> --> </div> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>缓冲运动</title> <meta charset="utf-8"> <style type="text/css"> div{width:300px;height:300px;background:red;position:absolute;left:0px;} p{width:1px;height:500px;background:black;position:absolute;left:600px;} </style> <script type="text/javascript"> window.onload = function() { var timer = null; var oDiv = document.getElementsByTagName('div')[0]; oDiv.onclick = function() { clearInterval(timer); timer = setInterval(move,30); } function move() { // 速度和距离成正比 var speed = (600 - oDiv.offsetLeft) / 50; // 对速度进行取整，不然无法到达目的距离 speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed); oDiv.style.left = oDiv.offsetLeft + speed + 'px'; document.title = oDiv.offsetLeft+','+speed; } } </script> </head> <body> <div></div> <p></p> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>第一个孩子节点</title> <meta charset="utf-8"> <script type="text/javascript"> window.onload = function() { var oUl =document.getElementsByTagName('ul')[0]; // 记得把如果调换顺序 然后调试 if(oUl.firstElementChild) oUl.firstElementChild.style.background = 'red'; else oUl.firstChild.style.background = 'red'; } </script> </head> <body> <ul> <li>从前有座山</li> <li>山上有座庙</li> <li>庙里有个老和尚</li> <li>老和尚对着小和尚说 </li> <li>我们这里有座山</li> <li>里面有个老和尚</li> </ul> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>运动停止边界问题</title> <meta charset="utf-8"> <style type="text/css"> body{margin:0;padding:0;} div{width:300px;height:300px;background:red;position:absolute;left:0px;} p{width:1px;height:500px;background:black;position:absolute;left:600px;} </style> <script type="text/javascript"> window.onload = function() { var timer = null; var oDiv = document.getElementsByTagName('div')[0]; oDiv.onclick = function() { clearInterval(timer); timer = setInterval(move,30); } function move() { if(oDiv.offsetLeft < 600) speed = 7; else if(oDiv.offsetLeft > 600) speed = -7; else speed = 0; // 匀速运动解决不能到达终点问题， // 因为距离有可能不是速度的整数倍， // 所以在快到的时候，就关闭定时器，然后直接把物体放在终点 // 缓冲运动不用考虑这个问题是因为对速度进行取整，可以慢慢往前面蹭 if(Math.abs(600 - oDiv.offsetLeft) < 7) { clearInterval(timer); oDiv.style.left = 600 + 'px'; } else oDiv.style.left = oDiv.offsetLeft + speed + 'px'; } } </script> </head> <body> <div></div> <p></p> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>对联效果</title> <meta charset="utf-8"> <style type="text/css"> body{height:5000px;} div{width:100px;height:150px;background:red;position:absolute;right:0px;bottom:0px;} </style> <script type="text/javascript"> window.onscroll = function() { var oDiv = document.getElementsByTagName('div')[0]; var scrollTop = document.documentElement.scrollTop || document.body.scrollTop; oDiv.style.top = (document.documentElement.clientHeight - oDiv.offsetHeight)/2 + scrollTop + 'px'; } </script> </head> <body> <div></div> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>多物体运动(卡住现象)</title> <meta charset="utf-8"> <style type="text/css"> div{width:100px;height:50px;margin:10px 0;background:red;} </style> <script type="text/javascript"> var timer = null; window.onload = function() { oDiv = document.getElementsByTagName('div'); for(var i=0; i < oDiv.length; i++) { oDiv[i].onmouseover = function() { move(this,500); } oDiv[i].onmouseout = function() { move(this,100); } } } function move(obj,target) { clearInterval(timer); timer = setInterval(function(){ var speed = (target -obj.offsetWidth) / 5; speed = speed > 0 ? Math.ceil(speed):Math.floor(speed); if( obj.offsetWidth == target ) clearInterval(timer); else obj.style.width = obj.offsetWidth + speed + 'px'; },30); } </script> </head> <body> <div></div> <div></div> <div></div> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>多物体运动(解决卡住现象)</title> <meta charset="utf-8"> <style type="text/css"> div{width:100px;height:50px;margin:10px 0;background:red;} </style> <script type="text/javascript"> window.onload = function() { var oDiv = document.getElementsByTagName('div'); for(var i=0; i < oDiv.length; i++) { //每个物体自己开一个定时器 //JS手动给对象添加属性 oDiv[i].timer = null; oDiv[i].onmouseover = function() { move(this,500); } oDiv[i].onmouseout = function() { move(this,100); } } } function move(obj,target) { clearInterval(obj.timer); obj.timer = setInterval(function(){ var speed = (target - obj.offsetWidth) / 5; speed = speed > 0 ? Math.ceil(speed):Math.floor(speed); if( obj.offsetWidth == target ) clearInterval(obj.timer); else obj.style.width = obj.offsetWidth + speed + 'px'; },30); } </script> </head> <body> <input type="text"/> <div></div> <div></div> <div></div> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>多物体渐变(属性不能公有)</title> <meta charset="utf-8"> <style type="text/css"> div{width:200px;height:200px;background:red;filter:alpha(opacity:30);opacity:0.3;float:left;margin:20px;} </style> <script type="text/javascript"> window.onload = function() { //var timer = null;//这个变量不应该定义在changeColorLight函数里面 //var light = 30;//这个变量不应该定义在changeColorLight函数里面 //初始值应该和样式表保持一致，不然会产生闪的效果 var oDiv = document.getElementsByTagName('div'); for(var i=0; i < oDiv.length; i++) { oDiv[i].timer = null;//貌似这个语句可以不用写 oDiv[i].light = 30;//这个不写的话会有问题 oDiv[i].onmouseover = function() { changeColorLight(this,100); } oDiv[i].onmouseout = function() { changeColorLight(this,30); } } function changeColorLight(obj,target) { //var timer = null; //var light = 0; clearInterval(obj.timer); obj.timer = setInterval(function(){ var speed = (target - obj.light) / 10; speed = speed > 0 ? Math.ceil(speed):Math.floor(speed); if(obj.light == target) clearInterval(obj.timer); else { obj.light += speed; obj.style.filter = 'alpha(opacity:'+obj.light+')'; obj.style.opacity = obj.light / 100; } },30); } } </script> </head> <body> <div></div> <div></div> <div></div> <div></div> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>offset问题</title> <meta charset="utf-8"> <style type="text/css"> div{width:200px;height:200px;background:yellow;float:left;margin:20px;border:1px solid red;} </style> <script type="text/javascript"> setInterval(function(){ //一开始有考虑到下面这个语句为什么不用写在onload事件中 var oDiv = document.getElementsByTagName('div')[0]; //alert(oDiv.offsetWidth); //因为width设置后，还要加上边框，所以也就是+2-1 //因此物体不是变窄，而是不断的变宽 oDiv.style.width = oDiv.offsetWidth -1 + 'px'; },30); </script> </head> <body> <div></div> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>offset问题（修复）</title> <meta charset="utf-8"> <style type="text/css"> div{width:200px;height:200px;background:yellow;float:left;margin:20px;border:1px solid red;} </style> <script type="text/javascript"> function getStyle(obj,name) { if( obj.currentStyle ) return obj.currentStyle[name];//obj.currentStyle.width else return getComputedStyle(obj,false)[name];//getComputedStyle(obj,false).width } setInterval(function(){ var oDiv = document.getElementsByTagName('div')[0]; //oDiv.style.width = oDiv.offsetWidth - 1 + 'px'; oDiv.style.width = parseInt( getStyle(oDiv,'width') ) - 1 + 'px'; },30); </script> </head> <body> <div></div> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>多物体运动框架（不能实现渐变）</title> <meta charset="utf-8"> <style type="text/css"> div{width:200px;height:200px;background:yellow;float:left;margin:20px;border:1px solid red;} </style> <script type="text/javascript"> window.onload = function() { var oDiv = document.getElementsByTagName('div')[0]; oDiv.onmouseover = function() { startMove(oDiv,'fontSize',50); } oDiv.onmouseout = function() { startMove(oDiv,'fontSize',12); } } function getStyle(obj,name) { if( obj.currentStyle ) return obj.currentStyle[name];//obj.currentStyle.width else return getComputedStyle(obj,false)[name];//getComputedStyle(obj,false).width } function startMove(obj,name,target) { clearInterval(obj.timer); obj.timer = setInterval(function(){ var speed = ( target - parseInt( getStyle(obj,name) ) ) / 10; speed = speed > 0 ? Math.ceil(speed):Math.floor(speed); if( parseInt( getStyle(obj,name) ) == target ) clearInterval( obj.timer ); else obj.style[name] = parseInt( getStyle(obj,name) ) + speed + 'px'; ; },30); } </script> </head> <body> <div>从前有一座山</div> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>多物体运动框架（实现渐变）</title> <meta charset="utf-8"> <style type="text/css"> div{width:200px;height:200px;background:yellow;float:left;margin:20px;border:1px solid red;filter:alpha(opacity:30);opacity:0.3;} </style> <script type="text/javascript"> window.onload = function() { var oDiv = document.getElementsByTagName('div')[0]; oDiv.onmouseover = function() { startMove(oDiv,'opacity',100); } oDiv.onmouseout = function() { startMove(oDiv,'opacity',30); } } function getStyle(obj,name) { if( obj.currentStyle ) return obj.currentStyle[name];//obj.currentStyle.width else return getComputedStyle(obj,false)[name];//getComputedStyle(obj,false).width } function startMove(obj,name,target) { clearInterval(obj.timer); obj.timer = setInterval(function(){ if( name == 'opacity') var status = parseFloat(getStyle(obj,name)) * 100; else var status = parseInt(getStyle(obj,name)); var speed = (target - status) / 6; speed = speed > 0 ? Math.ceil(speed):Math.floor(speed); if(status == target) clearInterval(obj.timer); else { if( name == 'opacity') { obj.style.filter = 'alpha(opacity:' + (status+speed) + ')'; obj.style.opacity = (status+speed) / 100; } else obj.style[name] = status + speed + 'px'; } },30); } </script> </head> <body> <div>从前有一座山</div> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>浮点数误差</title> <meta charset="utf-8"> <script type="text/javascript"> alert(0.07*100); alert(Math.round(0.07*100));//四舍五入 </script> </head> <body> </body></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>链式运动</title> <meta charset="utf-8"> <style type="text/css"> div{width:100px;height:100px;background:red;opacity: 0.3} </style> <script type="text/javascript"> window.onload = function() { var oDiv = document.getElementsByTagName('div')[0]; oDiv.onmouseover = function() { startMove(oDiv,'width',800, function(){startMove(oDiv,'height',600, function(){startMove(oDiv,'opacity',100)});}) } oDiv.onmouseout = function() { startMove(oDiv,'opacity',30, function(){startMove(oDiv,'height',100, function(){startMove(oDiv,'width',100)});}) } } </script> </head> <body> <div></div> </body> <script type="text/javascript"> function getStyle(obj,name) { if( obj.currentStyle ) return obj.currentStyle[name];//obj.currentStyle.width else return getComputedStyle(obj,false)[name];//getComputedStyle(obj,false).width } function startMove(obj,name,target,fnEnd) { clearInterval(obj.timer); obj.timer = setInterval(function(){ if( name == 'opacity') var status = parseFloat(getStyle(obj,name)) * 100; else var status = parseInt(getStyle(obj,name)); var speed = (target - status) / 6; speed = speed > 0 ? Math.ceil(speed):Math.floor(speed); if(status == target) { clearInterval(obj.timer); if(fnEnd) fnEnd(); } else { if( name == 'opacity') { obj.style.filter = 'alpha(opacity:' + (status+speed) + ')'; obj.style.opacity = (status+speed) / 100; } else obj.style[name] = status + speed + 'px'; } },30); } </script></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>运动框架小问题（不能多个属性同时运动）</title> <meta charset="utf-8"> <style type="text/css"> div{width:100px;height:100px;background:red;opacity: 0.3} </style> <script type="text/javascript"> window.onload = function() { var oDiv = document.getElementsByTagName('div')[0]; oDiv.onmouseover = function() { startMove(oDiv,'width',800); startMove(oDiv,'height',600); // 宽高并不是同时改变，仅仅是你改变了高度 } } </script> </head> <body> <div></div> </body> <script type="text/javascript"> function getStyle(obj,name) { if( obj.currentStyle ) return obj.currentStyle[name];//obj.currentStyle.width else return getComputedStyle(obj,false)[name];//getComputedStyle(obj,false).width } function startMove(obj,name,target,fnEnd) { clearInterval(obj.timer); obj.timer = setInterval(function(){ if( name == 'opacity') var status = parseFloat(getStyle(obj,name)) * 100; else var status = parseInt(getStyle(obj,name)); var speed = (target - status) / 6; speed = speed > 0 ? Math.ceil(speed):Math.floor(speed); if(status == target) { clearInterval(obj.timer); if(fnEnd) fnEnd(); } else { if( name == 'opacity') { obj.style.filter = 'alpha(opacity:' + (status+speed) + ')'; obj.style.opacity = (status+speed) / 100; } else obj.style[name] = status + speed + 'px'; } },30); } </script></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>解决运动框架小问题（多个属性同时运动）</title> <meta charset="utf-8"> <style type="text/css"> div{width:100px;height:100px;background:red;opacity: 0.3} </style> <script type="text/javascript"> window.onload = function() { var oDiv = document.getElementsByTagName('div')[0]; oDiv.onmouseover = function() { startMove(oDiv,{'width':500,'height':600,'opacity':100}); } oDiv.onmouseout = function() { startMove(oDiv,{'width':100,'height':100,'opacity':30}); } } </script> </head> <body> <div></div> </body> <script type="text/javascript"> function getStyle(obj,name) { if( obj.currentStyle ) return obj.currentStyle[name];//obj.currentStyle.width else return getComputedStyle(obj,false)[name];//getComputedStyle(obj,false).width } function startMove(obj,json,fnEnd) { clearInterval(obj.timer); obj.timer = setInterval(temp,30); function temp() { var isStop = true; for(var index in json) { if( index == 'opacity') var status = parseFloat(getStyle(obj,index)) * 100; else var status = parseInt(getStyle(obj,index)); if( status != json[index] ) isStop = false; var speed = (json[index] - status) / 6; speed = speed > 0 ? Math.ceil(speed):Math.floor(speed); if( index == 'opacity') { obj.style.filter = 'alpha(opacity:' + (status+speed) + ')'; obj.style.opacity = (status+speed) / 100; } else obj.style[index] = status + speed + 'px'; } if( isStop ) { clearInterval(obj.timer); if(fnEnd) fnEnd(); } } } </script></html><!-- *************************************************************************************--><!DOCTYPE html><html> <head> <title>留言板案例</title> <meta charset="utf-8"> <style type="text/css"> *{margin:0;padding:0;} ul{width:500px;min-height:50px;list-style:none;margin:50px auto;border:1px solid #CCC;overflow:hidden;} ul li{border-bottom:1px #DDD dashed;padding:5px;overflow:hidden;opacity:0;} </style> <script type="text/javascript"> window.onload = function() { var oTxt = document.getElementsByTagName('textarea')[0]; var oBtn = document.getElementsByTagName('input')[0]; var oUl = document.getElementsByTagName('ul')[0]; oBtn.onclick = function() { var oLi = document.createElement('li'); oLi.innerHTML = oTxt.value; oTxt.value = ''; if( oUl.children.length > 0 ) oUl.insertBefore(oLi,oUl.children[0]); else oUl.appendChild(oLi); var oHeight = oLi.offsetHeight; oLi.style.height = 0; startMove(oLi,{'height':oHeight},function(){ startMove(oLi,{'opacity':100}); } ); } } </script> </head> <body> <textarea></textarea> <input type="button" value="发布"> <ul></ul> </body> <script type="text/javascript"> function getStyle(obj,name) { if( obj.currentStyle ) return obj.currentStyle[name];//obj.currentStyle.width else return getComputedStyle(obj,false)[name];//getComputedStyle(obj,false).width } function startMove(obj,json,fnEnd) { clearInterval(obj.timer); obj.timer = setInterval(temp ,30); function temp() { var isStop = true; for(var index in json) { if( index == 'opacity') var status = parseFloat(getStyle(obj,index)) * 100; else var status = parseInt(getStyle(obj,index)); if( status != json[index] ) isStop = false; var speed = (json[index] - status) / 5; speed = speed > 0 ? Math.ceil(speed):Math.floor(speed); if( index == 'opacity') { obj.style.filter = 'alpha(opacity:' + (status+speed) + ')'; obj.style.opacity = (status+speed) / 100; } else obj.style[index] = status + speed + 'px'; } if( isStop ) { clearInterval(obj.timer); if(fnEnd) fnEnd(); } } } </script></html><!-- *************************************************************************************--> 4 0
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