怎么让用户收到浏览器的消息提醒？

function _Notification(title,option){
    var Notification = window.Notification || window.mozNotification || window.webkitNotification;
    Notification.permission === "granted"?creatNotification(title, option):requestPermission(title, option);
    function creatNotification(title, option){
       var instance = new Notification(title, option);
        instance.onclick = function () {
            console.log('onclick');
        };
        instance.onerror = function () {
            console.log('onerror');
        };
        instance.onshow = function () {
            console.log('onshow');
        };
        instance.onclose = function () {
            console.log("close")
        }
    }
    function requestPermission(title, option){
        Notification.requestPermission(function(status) {
            status === "granted"?creatNotification(title, option):failNotification(title);
        });
    }
    function failNotification(title){
        var timer;
        return function(timer){
            var index = 0;
            clearInterval(timer);
            timer = setInterval(function() {
                if(index%2) {
                    document.head.getElementsByTagName("title")[0].innerHTML = '【　　　】'+ title;
                }else {
                    document.head.getElementsByTagName("title")[0].innerHTML = '【新消息】'+ title;
                }
                index++;
                if(index > 20) {
                    clearInterval(timer);
                }
            }, 500);
        }(timer);
    }
}