notify(title, options, callback) {
          // 先检查浏览器是否支持
          if (!window.Notification) {
            return;
          }
          var notification;
          // 检查用户曾经是否同意接受通知
          if (Notification.permission === 'granted') {
            notification = new Notification(title, options); // 显示通知

          } else {
            var promise = Notification.requestPermission();
          }

          if (notification && callback) {
            notification.onclick = function(event) {
              callback(notification, event);
            }
          }
       },

notify("标题", {
            body: "内容",
            icon: "头像"
          }, function(notification) {

            notification.close();

});