JavaScript方法和技巧大全

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JavaScript方法和技巧大全基础知识
1 创建脚本块 <script language=”JavaScript”> JavaScript code goes here </script>
2 隐藏脚本代码 <script language=”JavaScript”> </script>
在不支持JavaScript的浏览器中将不执行相关代码

3 浏览器不支持的时候显示 <noscript> Hello to the non-JavaScript browser.</noscript>
4 链接外部脚本文件<script language=”JavaScript” src="/”filename.js"”></script>
5 注释脚本 // This is a comment

document.write(“Hello”); // This is a comment
/* All of this is a comment */
6 输出到浏览器 document.write(“<strong>Hello</strong>”);

7 定义变量 var myVariable = “some value”;

8 字符串相加 var myString = “String1” + “String2”;

9 字符串搜索 <script language=”JavaScript”><!-- var myVariable = “Hello there”;

var therePlace = myVariable.search(“there”); document.write(therePlace);// --> </script>
10 字符串替换 thisVar.replace(“Monday”,”Friday”);

11 格式化字串 <script language=”JavaScript”><!—

var myVariable = “Hello there”; document.write(myVariable.big() + “<br>”);

document.write(myVariable.blink() + “<br>”); document.write(myVariable.bold() + “<br>”);
document.write(myVariable.fixed() + “<br>”);document.write(myVariable.fontcolor(“red”) + “<br>”);
document.write(myVariable.fontsize(“18pt”) + “<br>”);document.write(myVariable.italics() + “<br>”);
document.write(myVariable.small() + “<br>”);document.write(myVariable.strike() + “<br>”);
document.write(myVariable.sub() + “<br>”);document.write(myVariable.sup() + “<br>”);

document.write(myVariable.toLowerCase() + “<br>”); document.write(myVariable.toUpperCase() + “<br>”);
var firstString = “My String”; var finalString = firstString.bold().toLowerCase().fontcolor(“red”);
// --></script>
12 创建数组<script language=”JavaScript”></script>
13 数组排序<script language=”JavaScript”> </script>
14 分割字符串1: <script language=”JavaScript”><!-- var myVariable = “a,b,c,d”;

24 取消定时执行 <script> <!-- function hello() { window.alert(“Hello”); }

var myTimeout = window.setTimeout(“hello()”,5000); window.clearTimeout(myTimeout);// --> </script>
25 在页面卸载时候执行函数 <body onUnload=”functionName();”> Body of the page </body>
2：浏览器输出 26 访问document对象
<script language=”JavaScript”>var myURL = document.URL; window.alert(myURL);</script>
27 动态输出HTML <script language=”JavaScript”>document.write(“<p>Here’s some information about this document:</p>”);
document.write(“<ul>”);document.write(“<li>Referring Document: “ + document.referrer + “</li>”); document.write(“<li>Domain: “ + document.domain + “</li>”); document.write(“<li>URL: “ + document.URL + “</li>”);
document.write(“</ul>”);</script>
28 输出换行 document.writeln(“<strong>a</strong>”); document.writeln(“b”);
29 输出日期 <script language=”JavaScript”> var thisDate = new Date(); document.write(thisDate.toString()); </script>
30 指定日期的时区 <script language=”JavaScript”> var myOffset = -2; var currentDate = new Date();

var userOffset = currentDate.getTimezoneOffset()/60;var timeZoneDifference = userOffset - myOffset;
currentDate.setHours(currentDate.getHours() + timeZoneDifference);

document.write(“The time and date in Central Europe is: “ + currentDate.toLocaleString());</script>
31 设置日期输出格式 <script language=”JavaScript”> var thisDate = new Date();

var thisTimeString = thisDate.getHours() + “:” + thisDate.getMinutes();

var thisDateString = thisDate.getFullYear() + “/” + thisDate.getMonth() + “/” + thisDate.getDate();
document.write(thisTimeString + “ on “ + thisDateString); </script>
32 读取URL参数 <script language=”JavaScript”> var urlParts = document.URL.split(“?”);
var parameterParts = urlParts[1].split(“&”);for (i = 0; i < parameterParts.length; i++) {
var pairParts = parameterParts［i］.split(“=”);var pairName = pairParts[0]; var pairValue = pairParts[1];
document.write(pairName + “ ：“ +pairValue ); }</script>

你还以为HTML是无状态的么？

33 打开一个新的document对象 <script language=”JavaScript”> function newDocument() {document.open();

document.write(“<p>This is a New Document.</p>”);document.close(); }</script>
34 页面跳转<script language=”JavaScript”>window.location = [url]http://www.phpNet.cn/[/url]”; </script>
35 添加网页加载进度窗口 <html><head><script language='javaScript'>

var placeHolder = window.open('holder.html','placeholder','width=200,height=200'); </script><title>The Main Page</title>
</head><body ><p>This is the main page</p></body></html>
3：图像
36 读取图像属性 <img src="/”image1.jpg"” name=”myImage”><a href=”# ” onClick=”window.alert(document.myImage.width)”>Width</a>

37 动态加载图像 <script language=”JavaScript”> myImage = new Image; myImage.src = “Tellers1.jpg”;</script>
38 简单的图像替换 <script language=”JavaScript”>rollImage = new Image; rollImage.src = “rollImage1.jpg”;
defaultImage = new Image;defaultImage.src = “image1.jpg”; </script>

<img src="/”image1.jpg"” name=”myImage” width=100 height=100 border=0>
39 随机显示图像 <script language=”JavaScript”>var imageList = new Array; imageList[0] = “image1.jpg”;

imageList[1] = “image2.jpg”;imageList[2] = “image3.jpg”;imageList[3] = “image4.jpg”;

var imageChoice = Math.floor(Math.random() * imageList.length);

document.write(‘<img src=”’ + imageList[imageChoice] + ‘“>’);</script>
40 函数实现的图像替换<script language=”JavaScript”> var source = 0; var replacement = 1;

function createRollOver(originalImage,replacementImage) { var imageArray = new Array; imageArray[source] = new Image;
imageArray[source].src = originalImage; imageArray[replacement] = new Image;
imageArray[replacement].src = replacementImage; return imageArray; }

var rollImage1 = createRollOver(“image1.jpg”,”rollImage1.jpg”); </script>
<a href=”#” onMouseOver=”document.myImage1.src = rollImage1[replacement].src;”
onMouseOut=”document.myImage1.src = rollImage1[source].src;”> <img src="/”image1.jpg"” width=100 name=”myImage1” border=0> </a>
41 创建幻灯片<script language=”JavaScript”>var imageList = new Array; imageList[0] = new Image;

imageList[0].src = “image1.jpg”;imageList[1] = new Image;imageList[1].src = “image2.jpg”;

imageList[2] = new Image; imageList[2].src = “image3.jpg”; imageList[3] = new Image; imageList[3].src = “image4.jpg”;
function slideShow(imageNumber) { document.slideShow.src = imageList[imageNumber].src; imageNumber += 1;
if (imageNumber < imageList.length) { window.setTimeout(“slideShow(“ + imageNumber + “)”,3000); }}</script>
</head><body onLoad=”slideShow(0)”><img src="/”image1.jpg"” width=100 name=”slideShow”>

42 随机广告图片 <script language=”JavaScript”>var imageList = new Array; imageList[0] = “image1.jpg”;

imageList[1] = “image2.jpg”;imageList[2] = “image3.jpg”; imageList[3] = “image4.jpg”; var urlList = new Array;
urlList[0] = [url]http://phpNet.cn/[/url]”; urlList[1] = [url]http://phpNet.cn/[/url]”; urlList[2] = [url]http://www.phpNet.cn/[/url]”;
urlList[3] = [url]http://www.phpNet.cn/bbs/[/url]”; var imageChoice = Math.floor(Math.random() * imageList.length);
document.write(‘<a href=”’ + urlList[imageChoice] + ‘“><img src=”’ + imageList[imageChoice] + ‘“></a>’);</script>
4：表单

43 表单构成 <form method=”post” action=”target.html” name=”thisForm”><input type=”text” name=”myText”>
<select name=”mySelect”><option value=”1”>First Choice</option><option value=”2”>Second Choice</option>
</select><br><input type=”submit” value=”Submit Me”></form>
44 访问表单中的文本框内容 <form name=”myForm”><input type=”text” name=”myText”>/form><a href='#' >Check Text Field</a>
45 动态复制文本框内容 <form name=”myForm”> Enter some Text: <input type=”text” name=”myText”><br>
Copy Text: <input type=”text” name=”copyText”></form><a href=”#” onClick=”document.myForm.copyText.value =
document.myForm.myText.value;”>Copy Text Field</a>

46 侦测文本框的变化

<form name=”myForm”>Enter some Text: <input type=”text” name=”myText” onChange=”alert(this.value);”></form>
47 访问选中的Select <form name=”myForm”> <select name=”mySelect”><option value=”First Choice”>1</option>
<option value=”Second Choice”>2</option><option value=”Third Choice”>3</option></select></form><a href='#' >Check Selection List</a>

48 动态增加Select项 <form name=”myForm”><select name=”mySelect”><option value=”First Choice”>1</option>
<option value=”Second Choice”>2</option></select></form><script language=”JavaScript”>

document.myForm.mySelect.length++;document.myForm.mySelect.options[document.myForm.mySelect.length - 1].text = “3”;
document.myForm.mySelect.options[document.myForm.mySelect.length - 1].value = “Third Choice”;</script>
49 验证表单字段<script language=”JavaScript”>function checkField(field) {if (field.value == “”) {
window.alert(“You must enter a value in the field”);field.focus(); } }</script>

Text Field: <input type=”text” name=”myField”onBlur=”checkField(this)”><br><input type=”submit”></form>
50 验证Select项function checkList(selection) { if (selection.length == 0) {

window.alert(“You must make a selection from the list.”);return false; }return true;}
51 动态改变表单的action <form name=”myForm” action=”login.html”>Username: <input type=”text” name=”username”><br>
Password: <input type=”password” name=”password”><br><input type=”button” value=”Login” onClick=”this.form.submit();”><input type=”button” value=”Register” onClick=”this.form.action = ‘register.html’; this.form.submit();”><input type=”button” value=”Retrieve Password” onClick=”this.form.action = ‘password.html’; this.form.submit();”></form>
52 使用图像按钮 <form name=”myForm” action=”login.html”> Username: <input type=”text” name=”username”><br>
Password: <input type=”password”name=”password”><br><input type=”image” src="/”login.gif"” value=”Login”>
</form>

53 表单数据的加密 <SCRIPT LANGUAGE='JavaScript'><!-- function encrypt(item) {var newItem = '';

for (i=0; i < item.length; i++) { newItem += item.charCodeAt(i) + '.'; }return newItem; }
function encryptForm(myForm) { for (i=0; i < myForm.elements.length; i++) {
myForm.elements［i］.value = encrypt(myForm.elements［i］.value);}}//--></SCRIPT>
<form name='myForm' > Enter Some Text: <input type=text name=myField><input type=submit></form>
5：窗口和框架

54 改变浏览器状态栏文字提示<script language=”JavaScript”> window.status = “A new status message”;</script>
55 弹出确认提示框 <script language=”JavaScript”>var userChoice = window.confirm(“Click OK or Cancel”);

if (userChoice) {document.write(“You chose OK”);} else { document.write(“You chose Cancel”); }</script>
56 提示输入 <script language=”JavaScript”>var userName = window.prompt(“Please Enter Your Name”,”Enter Your Name Here”);document.write(“Your Name is “ + userName);</script>

57 打开一个新窗口 //打开一个名称为myNewWindow的浏览器新窗口 <script language=”JavaScript”>

window.open([url]http://www.phpNet.cn/[/url]”,”myNewWindow”); </script>

58 设置新窗口的大小

window.open([url]http://www.phpNet.cn/[/url]”,”myNewWindow”,'height=300,width=300,left=200,screenX=200,top=100,screenY=100');
</script>
60 是否显示工具栏和滚动栏<script language=”JavaScript”>window.open(“http:
61 是否可以缩放新窗口的大小<script language=”JavaScript”>window.open([url]http://www.phpNet.cn/[/url]' , 'myNewWindow', 'resizable=yes' );</script>

62 加载一个新的文档到当前窗口<a href='#' 125a.html';' >Open New Document</a>
63 设置页面的滚动位置 <script language=”JavaScript”> if (document.all) { //如果是IE浏览器则使用scrollTop属性
document.body.scrollTop = 200;} else { //如果是NetScape浏览器则使用pageYOffset属性
window.pageYOffset = 200;}</script>

64 在IE中打开全屏窗口
<a href='#' onClick=”window.open([url]http://www.phpNet.cn/[/url]','newWindow','fullScreen=yes');”>Open a full-screen window</a>
65 新窗口和父窗口的操作<script language=”JavaScript”> //定义新窗口

var newWindow = window.open(“128a.html”,”newWindow”); newWindow.close(); //在父窗口中关闭打开的新窗口 </script>
在新窗口中关闭父窗口 window.opener.close()
66 往新窗口中写内容 <script language=”JavaScript”> var newWindow = window.open(“”,”newWindow”);

newWindow.document.open(); newWindow.document.write(“This is a new window”); newWIndow.document.close();</script>
67 加载页面到框架页面 <frameset cols=”50%,*”> <frame name=”frame1” src="/”135a.html"”>

在frame1中加载frame2中的页面 parent.frame2.document.location = “135b.html”;

68 在框架页面之间共享脚本如果在frame1中html文件中有个脚本 function doAlert() { window.alert(“Frame 1 is loaded”);}

那么在frame2中可以如此调用该方法<body onLoad=”parent.frame1.doAlert();”>This is frame 2.</body>
69 数据公用可以在框架页面定义数据项，使得该数据可以被多个框架中的页面公用
<script language=”JavaScript”>var persistentVariable = “This is a persistent value”;</script>
<frameset cols=”50%,*”><frame name=”frame1” src="/”138a.html"”><frame name=”frame2” src="/”138b.html"”> </frameset>这样在frame1和frame2中都可以使用变量persistentVariable
70 框架代码库根据以上的一些思路，我们可以使用一个隐藏的框架页面来作为整个框架集的代码库
<frameset cols=”0,50%,*”> <frame name=”codeFrame” src="/”140code.html"”> <frame name=”frame1” src="/”140a.html"”>
<frame name=”frame2” src="/”140b.html"”></frameset>