js获取URL参数

 

        function GetQueryString(name) {
            var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
            var r = window.location.search.substr(1).match(reg);
            if (r != null)
                return unescape(r[2]);
            return null;
        }

调用

        var returnurl = GetQueryString("returnUrl");
        if (returnurl != null && returnurl.length > 0)
        {
            window.location.href = returnurl;
        }