将以下代码保存为:a.js

function querystring(){      
    this.params = new Object();      
    this.initialize = function(){      
		var param=this.paramstring();      
		if(param.length == 0) return;      
		if(param.substring(0,1)=='?'){      
			param=param.substring(1);      
		}      
		param = param.replace(/\+/g, ' ');      
		var args = param.split('&');		  
		for (var i=0;i<args.length;i++){      
			var value;      
			var pair = args[i].split('=');      
			var name = unescape(pair[0]);      
			if (pair.length == 2)      
				value = unescape(pair[1]);      
			else     
				value = name;			 
			this.params[name] = value;      
		}      
    };      
    this.get = function(key, defvalue){      
		return this.params[key]==null?defvalue:this.params[key];      
    };      
    this.paramstring = function(){       
		var col=document.getElementsByTagName("script");       
		var jsrc=col.item(col.length-1).src;       
		var i=jsrc.indexOf("?");       
		var words=jsrc.substr(i+1,jsrc.length);       
		return(words);       
    };      
    this.initialize();      
}      
     
var q = new querystring();      
var a = q.get('a','defaultvalue'); //defaultvalue是默认值      
var b = q.get('b','defaultvalue'); //defaultvalue是默认值

调用:

<!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" />  
<script type="text/javascript" src="a.js?a=baidu&amp;b=google"></script>  
<title>无标题文档</title>  
</head>  
  
<body>  
<!--   
	js运行结果将得到:   
	a=baidu  
	b=google  
-->  
</body>  
</html>

是不是很有趣呢?呵呵~~

青锋幽灵

゛. - 看過世间最冷漠滴眼神,  爱過⒈生最无缘滴人﹎


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