layer.alert的回调函数

layer.alert(res.message, {
        title: languageObject.language1,
        icon: 2
}, function (index) {
        //do something
        //删除相关用户信息
        localStorage.removeItem('userName');
        localStorage.removeItem('userInfo');
        localStorage.removeItem('userToken');
        //跳转回登录页
        location.href = "login.html";
        layer.close(index);
});