js写得QueryString()

 function QueryString()
               {
                    var name,value,i;
                    var str=location.href;//获得浏览器地址栏URL串
                    var num=str.indexOf("?")
                    str=str.substr(num+1);//截取“?”后面的参数串
                    var arrtmp=str.split("&");//将各参数分离形成参数数组
                    for(i=0;i < arrtmp.length;i++)
                    {
                        num=arrtmp[i].indexOf("=");
                        if(num>0)
                        {
                            name=arrtmp[i].substring(0,num);//取得参数名称
                            value=arrtmp[i].substr(num+1);//取得参数值
                            this[name]=value;//定义对象属性并初始化
                        }
                    }
                    return this[name];
               }