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Js_file01.js 
========
//³ÌÐò´úÂë
document.write(" <script  language=\"javascript\"  src="\/com\/ Js_file02.js \"  > <\/script>"); 
 
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html´úÂë
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<html>
<body>
<input type="button" value="ok" onclick="javascript:fun_b()">
</body>
//±ØÐëÔÚÕâ¸öλÖã¬Ò²¼´<body>...</body>Ö®ÏÂ:
<script language="JAVASCRIPT" src='Js_b.js'> </script>
</html>
 
Js_b.js
========
//³ÌÐò´úÂë
new_element=document.createElement("script");
new_element.setAttribute("type","text/javascript");
new_element.setAttribute("src"," Js_a.js");
document.body.appendChild(new_element);
 
function fun_b ()
{
Fun_a();
}
 
Js_a.js
========
//³ÌÐò´úÂë
function Fun_a ()
{
alert("a");
}
 
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Js_file01.js 
========
//³ÌÐò´úÂë
document.scripts[0].src=" Js_file02.js"   // only ie
http://www.pqshow.com/design ......

javascript framework£¬ JS³£Óú¯Êý£¨·½·¨£©£¬jQuery

//Register NameSpace for window.MSN
if(!window.MSN)
{
    window.MSN = {};
}
if(!window.MSN.SET)
{
    window.MSN.SET = {};
}
if(!window.MSN.SET.Utilities)
{
    window.MSN.Utilities = {};
}
//Check you borwse type
//IE7 &IE8 & FF etc can render hover for div tags, but can't render under IE6.0
//this function can render hover for div under IE6.0 browse
//
MSN.SET.Utilities = {
    WebBrowserType: { IE6: 'MSIE 6.0', IE7: 'MSIE 7.0', IE8: 'MSIE 8.0', Firefox: 'Mozilla', Unknow: 'unknow' },
    checkUserWebBrowser:function(){
         var userAgent = window.navigator.userAgent;
        
         if(userAgent.indexOf(MSN.SET.Utilities.WebBrowserType.IE8) > -1) {
             return MSN.SET.Utilities.WebBr ......

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JavaScriptÄ£¿éËæÒâÍ϶¯</title>
 <style type="text/css">
 html{
  width:100%;
  overflow-x:hidden;
 }
 body{
  font-family: Trebuchet MS, Lucida Sans Unicode, Arial, sans-serif;
  width:100%;
  margin:0px;
  padding:0px;
  text-align:center;
  background-color:#E2EBED; 
  font-size:0.7em; 
  overflow-x:hidden;
 }
  
 #mainContainer{
  width:600px;
  margin:0 auto;
  text-align:left;
  background-color:#FFF;
 }
 h4{
  margin:0px;
 }
 p{
  margi ......

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±ÈÈç:<script type=”text/javascript” src=”xxx.js” charset=”UTF-8″>.
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l       ²éÕÒÔªËØ½Úµã£¬document.getElementById("bj");
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