js使用正则表达式从url中获取参数值

    //从url中获取参数值
    function getvl(name) {
        var reg = new RegExp("(^|\\?|&)"+ name +"=([^&]*)(\\s|&|$)", "i");
        if (reg.test(location.href)) return unescape(RegExp.$2.replace(/\+/g, " "));
        return "";
    };
    var code = getvl("code");