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");