//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");