javascript取网页地址参数

    var URLParams = new Array();
    var flag;
    var aParams = document.location.search.substr(1).split('&');
    
    if (aParams.length > 0)
    {
        for (i=0; i < aParams.length;  i++){
        var aParam = aParams[i].split('=');
        URLParams[aParam[0]] = aParam[1];
        }

        //取得传过来的flag参数
        flag=URLParams["flag"];
    }


    if ((flag == null)||(flag == undefined) || (flag < 1) || (flag > 6))
        flag=1;