api日常总结：前端常用js函数和CSS常用技巧
来源：互联网 发布：access vba编程教程 编辑：程序博客网 时间：2024/06/13 22:47
我的移动端media
html{font-size:10px}@media screen and (min-width:321px) and (max-width:375px){html{font-size:11px}}@media screen and (min-width:376px) and (max-width:414px){html{font-size:12px}}@media screen and (min-width:415px) and (max-width:639px){html{font-size:15px}}@media screen and (min-width:640px) and (max-width:719px){html{font-size:20px}}@media screen and (min-width:720px) and (max-width:749px){html{font-size:22.5px}}@media screen and (min-width:750px) and (max-width:799px){html{font-size:23.5px}}@media screen and (min-width:800px){html{font-size:25px}}forEach()与map()方法
一个数组组成最大的数：
对localStorage的封装，使用更简单
//在get时，如果是JSON格式，那么将其转换为JSON，而不是字符串。以下是基础代码：var Store = { get: function(key) { var value = localStorage.getItem(key); if (value) { try { var value_json = JSON.parse(value); if (typeof value_json === 'object') { return value_json; } else if (typeof value_json === 'number') { return value_json; } } catch(e) { return value; } } else { return false; } }, set: function(key, value) { localStorage.setItem(key, value); }, remove: function(key) { localStorage.removeItem(key); }, clear: function() { localStorage.clear(); }};
在此基础之上，可以扩展很多方法，比如批量保存或删除一些数据：// 批量保存，data是一个字典Store.setList = function(data) { for (var i in data) { localStorage.setItem(i, data[i]); }};// 批量删除，list是一个数组Store.removeList = function(list) { for (var i = 0, len = list.length; i < len; i++) { localStorage.removeItem(list[i]); }};js判断滚动条是否到底部：
<!DOCTYPE html><html><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" /><title></title><script src=""></script><style type="text/css">* {padding: 0px;margin: 0px;}#main {width: 100%;height: 2000px;background: pink;}</style><script type="text/javascript">$(window).scroll(function() { var scrollTop = $(this).scrollTop(); var docHeight = $(document).height(); var windowHeight = $(this).height();var scrollHeight=document.body.scrollHeight;console.log("scrollTop:"+scrollTop);console.log("scrollbottom:"+(docHeight-scrollTop-windowHeight));if(scrollTop + windowHeight == docHeight) { alert("已经到最底部了！"); }});</script></head><body><div id="main"></div></body></html>
js操作cookie
JS设置cookie: 假设在A页面中要保存变量username的值("jack")到cookie中,key值为name，则相应的JS代码为： document.cookie="name="+username; JS读取cookie: 假设cookie中存储的内容为：name=jack;password=123 则在B页面中获取变量username的值的JS代码如下：var username=document.cookie.split(";")[0].split("=")[1]; //JS操作cookies方法! //写cookies function setCookie(name,value) { var Days = 30; var exp = new Date(); exp.setTime(exp.getTime() + Days*24*60*60*1000); document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString(); } //读取cookies function getCookie(name) { var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)"); if(arr=document.cookie.match(reg)) return unescape(arr[2]); else return null; } //删除cookies function delCookie(name) { var exp = new Date(); exp.setTime(exp.getTime() - 1); var cval=getCookie(name); if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString(); } //使用示例 setCookie("name","hayden"); alert(getCookie("name")); //如果需要设定自定义过期时间 //那么把上面的setCookie 函数换成下面两个函数就ok; //程序代码 function setCookie(name,value,time){ var strsec = getsec(time); var exp = new Date(); exp.setTime(exp.getTime() + strsec*1); document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString(); } function getsec(str){ alert(str); var str1=str.substring(1,str.length)*1; var str2=str.substring(0,1); if (str2=="s") { return str1*1000; } else if (str2=="h") { return str1*60*60*1000; } else if (str2=="d") { return str1*24*60*60*1000; } } //这是有设定过期时间的使用示例： //s20是代表20秒 //h是指小时，如12小时则是：h12 //d是天数，30天则：d30 setCookie("name","hayden","s20");/***************************************/function getCookie(name){ if(name){ var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)"); if(arr=document.cookie.match(reg)) return (decodeURIComponent(arr[2])); else return null; } return null; };function setCookie(name,value,Days){ if(!Days)Days=3000; var exp = new Date(); exp.setTime(exp.getTime() + Days*24*60*60*1000000); document.cookie = name + "="+ encodeURIComponent(value) + ";domain=weshare.com.cn;expires=" + exp.toGMTString() + ";path=/"; };获取URL参数：
function GetURLlist(name) { var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)"); var r = window.location.search.substr(1).match(reg); if(r != null) return unescape(r[2]); return null; };
IOS和安卓判断：
var u = navigator.userAgent, app = navigator.appVersion;var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1; //android终端或者uc浏览器var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端 if(isAndroid){ $(".down0").css('display','none') }else if(isiOS){ $(".down").css('display','none') } else{ return false; }
判断微信：
function isWeiXin(){ var ua = window.navigator.userAgent.toLowerCase(); if(ua.match(/MicroMessenger/i) == 'micromessenger'){ return true; }else{ return false; } }
var u = navigator.userAgent;var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1|| u.indexOf('MI') > -1|| <br>u.indexOf('XiaoMi') > -1; //android终端或者uc，小米等奇葩浏览器 if(!isAndroid) {} if(isAndroid) {}
判断页面滚动方向：
<script type="text/javascript"> $(function() { function scroll(fn) { var beforeScrollTop = document.body.scrollTop, fn = fn || function() {}; window.addEventListener("scroll", function() { var afterScrollTop = document.body.scrollTop, delta = afterScrollTop - beforeScrollTop; if(delta === 0) return false; fn(delta > 0 ? "down" : "up"); beforeScrollTop = afterScrollTop; }, false); } scroll(function(direction) { if(direction == "down") { console.log("向下滚"); } else { console.log("向上滚"); } }); }); </script>
<script type="text/javascript"> var windowHeight = $(window).height(); $("body").css("height", windowHeight); var startX, startY, moveEndX, moveEndY, X, Y; $("body").on("touchstart", function(e) { e.preventDefault(); startX = e.originalEvent.changedTouches[0].pageX, startY = e.originalEvent.changedTouches[0].pageY; }); $("body").on("touchmove", function(e) { e.preventDefault(); moveEndX = e.originalEvent.changedTouches[0].pageX, moveEndY = e.originalEvent.changedTouches[0].pageY, X = moveEndX - startX, Y = moveEndY - startY; if (Math.abs(X) > Math.abs(Y) && X > 0) { alert("left to right"); } else if (Math.abs(X) > Math.abs(Y) && X < 0) { alert("right to left"); } else if (Math.abs(Y) > Math.abs(X) && Y > 0) { alert("top to bottom"); } else if (Math.abs(Y) > Math.abs(X) && Y < 0) { alert("bottom to top"); } else { alert("just touch"); } }); </script>排序
<script type="text/javascript"> var a = [1, 18, 23, 9, 16, 10, 29, 17]; var t = 0; for(var i = 0; i < a.length; i++) { for(var j = i + 1; j < a.length; j++) { if(a[i] > a[j]) { t = a[i]; a[i] = a[j]; a[j] = t; } } } console.log(a); //[1, 9, 10, 16, 17, 18, 23, 29] </script>
倒计时：
<!Doctype html><html> <head> <meta charset="utf-8"> <title>下班倒计时</title> <style> * { margin: 0; padding: 0; } body { font-size: 16px; text-align: center; font-family: arial; } .time { margin-top: 10px; border: 1px solid red; height: 30px; padding: 2px; line-height: 30px; } </style> </head> <body> <div class="time"> <span id="t_d">00天</span> <span id="t_h">00时</span> <span id="t_m">00分</span> <span id="t_s">00秒</span> </div> <script> setInterval(function() { var EndTime = new Date('2016/06/13 00:00:00'); var NowTime = new Date(); var t = EndTime.getTime() - NowTime.getTime(); var d = 0; var h = 0; var m = 0; var s = 0; if (t >= 0) { d = Math.floor(t / 1000 / 60 / 60 / 24); h = Math.floor(t / 1000 / 60 / 60 % 24); m = Math.floor(t / 1000 / 60 % 60); s = Math.floor(t / 1000 % 60); } document.getElementById("t_d").innerHTML = d + "天"; document.getElementById("t_h").innerHTML = h + "时"; document.getElementById("t_m").innerHTML = m + "分"; document.getElementById("t_s").innerHTML = s + "秒"; }, 10); </script> </body></html>
类型判断：
function _typeOf(obj) {return Object.prototype.toString.call(obj).toLowerCase().slice(8, -1); //}判断undefined: <span style="font-size: small;">var tmp = undefined; if (typeof(tmp) == "undefined"){ alert("undefined"); }</span> 判断null: <span style="font-size: small;">var tmp = null; if (!tmp && typeof(tmp)!="undefined" && tmp!=0){ alert("null"); } </span> 判断NaN: var tmp = 0/0; if(isNaN(tmp)){ alert("NaN"); }判断undefined和null: <span style="font-size: small;">var tmp = undefined; if (tmp== undefined) { alert("null or undefined"); } </span> <span style="font-size: small;">var tmp = undefined; if (tmp== null) { alert("null or undefined"); }</span> 判断undefined、null与NaN: <span style="font-size: small;">var tmp = null; if (!tmp) { alert("null or undefined or NaN"); }</span>
Ajax
jquery ajax函数
我自己封装了一个ajax的函数，代码如下：
var Ajax = function(url, type success, error) { $.ajax({ url: url, type: type, dataType: 'json', timeout: 10000, success: function(d) { var data = d.data; success && success(data); }, error: function(e) { error && error(e); } });};// 使用方法：Ajax('/data.json', 'get', function(data) { console.log(data);});
jsonp方式
有时候我们为了跨域，要使用jsonp的方法，我也封装了一个函数：
function jsonp(config) { var options = config || {}; // 需要配置url, success, time, fail四个属性 var callbackName = ('jsonp_' + Math.random()).replace(".", ""); var oHead = document.getElementsByTagName('head')[0]; var oScript = document.createElement('script'); oHead.appendChild(oScript); window[callbackName] = function(json) { //创建jsonp回调函数 oHead.removeChild(oScript); clearTimeout(oScript.timer); window[callbackName] = null; options.success && options.success(json); //先删除script标签，实际上执行的是success函数 }; oScript.src = options.url + '?' + callbackName; //发送请求 if (options.time) { //设置超时处理 oScript.timer = setTimeout(function () { window[callbackName] = null; oHead.removeChild(oScript); options.fail && options.fail({ message: "超时" }); }, options.time); }};// 使用方法：jsonp({ url: '/b.com/b.json', success: function(d){ //数据处理 }, time: 5000, fail: function(){ //错误处理 } });JS生成随机字符串的最佳实践
var random_str = function() { var len = 32; var chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890'; var max = chars.length; var str = ''; for (var i = 0; i < len; i++) { str += chars.charAt(Math.floor(Math.random() * max)); } return str;};//这样生成一个32位的随机字符串，相同的概率低到不可能。常用正则表达式
JavaScript过滤Emoji的最佳实践
name = name.replace(/\uD83C[\uDF00-\uDFFF]|\uD83D[\uDC00-\uDE4F]/g, "");
手机号验证：
var validate = function(num) { var reg = /^1[3-9]\d{9}$/; return reg.test(num);};
身份证号验证：
var reg = /^[1-9]{1}[0-9]{14}$|^[1-9]{1}[0-9]{16}([0-9]|[xX])$/;
ip验证：
var reg = /^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])(\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])){3}$/
常用js函数
返回顶部：
$(window).scroll(function() { var a = $(window).scrollTop(); if(a > 100) { $('.go-top').fadeIn(); }else { $('.go-top').fadeOut(); }});$(".go-top").click(function(){ $("html,body").animate({scrollTop:"0px"},'600');});
阻止冒泡：
function stopBubble(e){ e = e || window.event; if(e.stopPropagation){ e.stopPropagation(); //W3C阻止冒泡方法 }else { e.cancelBubble = true; //IE阻止冒泡方法 } }
全部替换replaceAll：
var replaceAll = function(bigStr, str1, str2) { //把bigStr中的所有str1替换为str2 var reg = new RegExp(str1, 'gm'); return bigStr.replace(reg, str2);}
获取浏览器url中的参数值：
var getURLParam = function(name) { return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)', "ig").exec(location.search) || [, ""])[1].replace(/\+/g, '%20')) || null;};
深度拷贝对象：
function cloneObj(obj) { var o = obj.constructor == Object ? new obj.constructor() : new obj.constructor(obj.valueOf()); for(var key in obj){ if(o[key] != obj[key] ){ if(typeof(obj[key]) == 'object' ){ o[key] = mods.cloneObj(obj[key]); }else{ o[key] = obj[key]; } } } return o;}
数组去重：
var unique = function(arr) { var result = [], json = {}; for (var i = 0, len = arr.length; i < len; i++){ if (!json[arr[i]]) { json[arr[i]] = 1; result.push(arr[i]); //返回没被删除的元素 } } return result;};
判断数组元素是否重复：
var isRepeat = function(arr) { //arr是否有重复元素 var hash = {}; for (var i in arr) { if (hash[arr[i]]) return true; hash[arr[i]] = true; } return false;};
生成随机数：
function randombetween(min, max){ return min + (Math.random() * (max-min +1));}
操作cookie：
own.setCookie = function(cname, cvalue, exdays){ var d = new Date(); d.setTime(d.getTime() + (exdays*24*60*60*1000)); var expires = 'expires='+d.toUTCString(); document.cookie = cname + '=' + cvalue + '; ' + expires;};own.getCookie = function(cname) { var name = cname + '='; var ca = document.cookie.split(';'); for(var i=0; i< ca.length; i++) { var c = ca[i]; while (c.charAt(0) == ' ') c = c.substring(1); if (c.indexOf(name) != -1) return c.substring(name.length, c.length); } return '';};
数据类型： underfined、null、0、false、NaN、空字符串。他们的逻辑非结果均为true。
闭包格式： 好处：避免命名冲突（全局变量污染）。
(function(a, b) { console.log(a+b); //30})(10, 20);
截取和清空数组：
var arr = [12, 222, 44, 88];arr.length = 2; //截取，arr = [12, 222]; arr.length = 0; //清空，arr will be equal to [].
获取数组的最大最小值：
var numbers = [5, 45822, 120, -215];var maxInNumbers = Math.max.apply(Math, numbers); //45822var minInNumbers = Math.min.apply(Math, numbers); //-215
浮点数计算问题：
0.1 + 0.2 == 0.3 //false
为什么呢？因为0.1+0.2等于0.30000000000000004。JavaScript的数字都遵循IEEE 754标准构建，
在内部都是64位浮点小数表示。可以通过使用toFixed()来解决这个问题。
数组排序sort函数：
var arr = [1, 5, 6, 3]; //数字数组arr.sort(function(a, b) { return a - b; //从小到大排 return b - a; //从大到小排 return Math.random() - 0.5; //数组洗牌});
var arr = [{ //对象数组 num: 1, text: 'num1'}, { num: 5, text: 'num2'}, { num: 6, text: 'num3'}, { num: 3, text: 'num4'}]; arr.sort(function(a, b) { return a.num - b.num; //从小到大排 return b.num - a.num; //从大到小排});
对象和字符串的转换：
var obj = {a: 'aaa', b: 'bbb'};var objStr = JSON.stringify(obj); // "{"a":"aaa","b":"bbb"}"var newObj = JSON.parse(objStr); // {a: "aaa", b: "bbb"}
对象拷贝与赋值
var obj = { name: 'xiaoming', age: 23};var newObj = obj;newObj.name = 'xiaohua';console.log(obj.name); // 'xiaohua'console.log(newObj.name); // 'xiaohua'
上方我们将obj对象赋值给了newObj对象，从而改变newObj的name属性，但是obj对象的name属性也被
篡改，这是因为实际上newObj对象获得的只是一个内存地址，而不是真正 的拷贝，所以obj对象被篡改。
var obj2 = { name: 'xiaoming', age: 23};var newObj2 = Object.assign({}, obj2, {color: 'blue'});newObj2.name = 'xiaohua';console.log(obj2.name); // 'xiaoming'console.log(newObj2.name); // 'xiaohua'console.log(newObj2.color); // 'blue'
上方利用Object.assign()方法进行对象的深拷贝可以避免源对象被篡改的可能。因为Object.assign()
方法可以把任意多个的源对象自身的可枚举属性拷贝给目标对象，然后返回目标对象。
var obj3 = { name: 'xiaoming', age: 23};var newObj3 = Object.create(obj3);newObj3.name = 'xiaohua';console.log(obj3.name); // 'xiaoming'console.log(newObj3.name); // 'xiaohua'
我们也可以使用Object.create()方法进行对象的拷贝，Object.create()方法可以创建一个具有指定原型对
象和属性的新对象。
git笔记
git使用之前的配置：
1.git config --global user.email xxx@163.com2.git config --global user.name xxx3.ssh-keygen -t rsa -C xxx@163.com(邮箱地址) // 生成ssh4.找到.ssh文件夹打开，使用cat id_rsa.pub //打开公钥ssh串5.登陆github，settings － SSH keys － add ssh keys （把上面的内容全部添加进去即可）
说明：然后这个邮箱（xxxxx@gmail.com）对应的账号在github上就有权限对仓库进行操作了。可以
尽情的进行下面的git命令了。
git常用命令：
1、git config user.name / user.email //查看当前git的用户名称、邮箱2、git clone https://github.com/jarson7426/javascript.git project //clone仓库到本地。3、修改本地代码，提交到分支: git add file / git commit -m “新增文件”4、把本地库推送到远程库: git push origin master5、查看提交日志：git log -56、返回某一个版本：git reset --hard 1237、分支：git branch / git checkout name / git checkout -b dev8、合并name分支到当前分支：git merge name / git pull origin9、删除本地分支：git branch -D name10、删除远程分支： git push origin :daily/x.x.x11、git checkout -b mydev origin/daily/1.0.0 //把远程daily分支映射到本地mydev分支进行开发12、合并远程分支到当前分支 git pull origin daily/1.1.113、发布到线上： git tag publish/0.1.5 git push origin publish/0.1.5:publish/0.1.514、线上代码覆盖到本地： git checkout --theirs build/scripts/ddos git checkout --theirs src/app/ddos
判断是否有中文：
var reg = /.*[\u4e00-\u9fa5]+.*$/;reg.test('123792739测试') //true
判断是对象还是数组：
function isArray = function(o) { return toString.apply(o) === '[object Array]';}function isObject = function(o) { return toString.apply(o) === '[object Object]';}
CSS修改滚动条样式：
::-webkit-scrollbar {width: 10px;background-color: #ccc;}::-webkit-scrollbar-track {background-color: #ccc;border-radius: 10px;}::-webkit-scrollbar-thumb {background-color: rgb(255, 255, 255);background-image: -webkit-gradient(linear, 40% 0%, 75% 84%, from(rgb(77, 156, 65)), color-stop(0.6, rgb(84, 222, 93)), to(rgb(25, 145, 29)));border-radius: 10px;}
单行多行省略号：
<style type="text/css"> .inaline { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; /*clip 修剪文本。*/ } .intwoline { display: -webkit-box !important; overflow: hidden; text-overflow: ellipsis; word-break: break-all; -webkit-box-orient: vertical; -webkit-line-clamp: 3; } </style>
遮罩：
<!doctype html><html lang="en"><head><meta charset="UTF-8" /><title>RGBA 遮罩</title><style type="text/css">* {padding: 0px;margin: 0px;}html,body {width: 100%;min-height: 100%;background: white;}div.mask {display: none;position: fixed;top: 0px;left: 0px;width: 100%;height: 100%;background: rgba(0, 0, 0, 0.7);}div.masks-body {width: 300px;height: 300px;position: absolute;top: 0px;left: 0px;bottom: 0px;right: 0px;background: green;margin: auto;}p {position: absolute;width: 30px;height: 30px;background: red;right: 0px;top: -30px;}</style><script type="text/javascript">window.onload = function() {document.querySelector("#main").onclick = function() {document.querySelector(".mask").style.display = "block";}document.querySelector("p#close").onclick=function(){document.querySelector(".mask").style.display = "none";}}</script></head><body><button id="main">点我</button><div class="mask"><div class="masks-body"><p id="close"></p></div></div></body></html>
常见页面flex布局：
<!doctype html><html lang="en"><head><meta charset="UTF-8" /><title></title><style type="text/css">* {padding: 0px;margin: 0px;}html,body {width: 100%;min-height: 100%;min-width: 1200px;overflow-x: hidden;}h1 {color: red;text-align: center;}#main0 {height: 400px;background: black;display: flex;flex-flow: row wrap;justify-content: flex-start;align-items: flex-start;}#main0 div:nth-child(2n) {flex: 1;height: 200px;font-size: 100px;line-height: 200px;text-align: center;background: red;}#main0 div:nth-child(2n+1) {flex: 1;height: 200px;line-height: 200px;font-size: 100px;text-align: center;background: blue;}#main1 {height: 400px;background: pink;display: flex;flex-flow: row nowrap;justify-content: flex-start;align-items: flex-start;}#main1 div:nth-child(2n) {flex: 1;height: 200px;font-size: 100px;line-height: 200px;text-align: center;background: red;}#main1 div:nth-child(2n+1) {width: 300px;height: 200px;font-size: 100px;line-height: 200px;text-align: center;background: blue;}#main2 {height: 400px;background: yellow;display: flex;flex-flow: row nowrap;justify-content: flex-start;align-items: flex-start;}#main2 div:nth-child(2n) {flex: 1;height: 200px;font-size: 100px;line-height: 200px;text-align: center;background: red;}#main2 div:nth-child(2n+1) {width: 300px;height: 200px;font-size: 100px;line-height: 200px;text-align: center;background: blue;}#main3 {height: 400px;background: fuchsia;display: flex;flex-flow: row nowrap;justify-content: flex-start;align-items: flex-start;}#main3 div.div1 {flex: 1;height: 200px;font-size: 100px;line-height: 200px;text-align: center;background: blue;}#main3 div.div2 {flex: 2;height: 200px;font-size: 100px;line-height: 200px;text-align: center;background: red;}#main3 div.div3 {flex: 3;height: 200px;font-size: 100px;line-height: 200px;text-align: center;background: orange;}</style></head><body><h1>等分布局</h1><div id="main0"><div>1</div><div>2</div><div>3</div><div>4</div><div>5</div></div><h1>左边固定右边自适应布局</h1><div id="main1"><div>1</div><div>2</div></div><h1>左右固定中间自适应布局</h1><div id="main2"><