Notification消息提醒

if (window.Notification) {
        console.log(Notification.permission);
        if (Notification.permission === 'granted') {
          var notification = new Notification('标题', { body: "内容可以自己随便定义" });
          notification.onclick = function (e) {
            alert("点击了我")//可以点击打开一个网址
          }
        } else {
          console.log('sss');
          Notification.requestPermission();//设置允许通知
        }
      }