非常好用的Js的querystring类

/**  
	Powered By CMSDream Copyright © 2007-2008 All rights reserved.  
	15:10 2008-6-7  
**/  
function querystring(paramstring){   
	this.url=window.location.href;   
	this.params = new Object();   
	this.initialize = function(){   
		if(paramstring.length == 0) return;   
		if(paramstring.substring(0,1)=='?'){   
			paramstring=paramstring.substring(1);   
		}   
		paramstring = paramstring.replace(/\+/g, ' ');   
		var args = paramstring.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.setkey = function(key,value){   
		var fragPos = this.url.lastIndexOf("#");   
		var fragment = "";   
		if(fragPos > -1){   
			fragment = this.url.substring(fragPos);   
			this.url = this.url.substring(0,fragPos);   
		}   
		var querystart = this.url.indexOf("?");   
		if(querystart<0){   
			this.url +="?"+key+"="+value;   
		}else if(querystart==this.url.length-1){   
			this.url +=key+"="+value;   
		}else{   
			var Re = new RegExp(key+"=[^\\s&amp;#]*","gi");   
			if (Re.test(this.url)){   
				this.url=this.url.replace(Re,key+"="+value);   
			}else{   
				this.url += "&amp;"+key+"="+value;   
			}   
		}   
		return this.url;   
	};   
	this.initialize();   
}

//假设网址为：http://www.a.com/aa.htm?a=value1&b=value2	  
var q = new qerystring(location.search);	  
	 
//如果取不到值用第二个参数作为默认值。	  
var a = q.get('a','defaultvalue');	   
var b = q.get('b','defaultvalue');	  
	 
/*	
运行结果：	
a=value1
b=value2
*/	
  
/***********************************  
 如果要将网址插入一个参数  
 如：http://www.a.com/aa.htm?a=value1&b=value2&page=3  
************************************/  
var q = new qerystring(location.search);   
var url = q.setkey('page','3');   
  
//url 是所得的结果

• JavaScript
• querystring
• 技术人生