获取地址栏中的参数

<script type="text/javascript">
        function GetQuerString(name){ 
            if(typeof(this.data)=="undefined"){
                this.data=new Array();
            }else{      
                for(p in this.data){
                    var args=this.data[p].split(':');
                    if(args[0]==name){
                        return args[1];
                    }
                }
            }         
            var url=window.location.search;          
            if(url.indexOf('?')<0){             
                return null
            }
           var index=url.indexOf(name+"=");
           if(index<0){
                return null
            }           
           var args=url.indexOf('&',index);  
           var value;                  
            if(args>0){ 
                value=url.substring(index+name.length+1,args);                 
            }
            else{                
                value=url.substring(index+name.length+1,url.length);
            }
            this.data.push(name+":"+value);           
            return value;    
        }
        //注意：substring,substr都是小写
         //substring(startindex,endindex)
        //substr(startindex,length)
    </script>