一段时间后推送通知在Chrome for

Question

我的代码每5秒检查一次新邮件。当新消息到达时，它会发出推送通知。然而，这次推送仅在我访问Android手机中的页面后几分钟工作（我使用谷歌浏览器）。如果我访问该页面并且有人在10分钟后发送消息，那么在我再次手动进入该网站之前，我不会收到任何通知。任何想法如何在一段时间后获得推送通知？

  <script>
function function_update(){
    var text='hello world';
                $.ajax({
      type: "GET",
      url: 'jquery_get_data.php',
      data: { keyword : text },
      success: function(data) {
/*  alert(data);*/
if (data.trim()) {
$("#texterna").append(data);
window.scrollTo(0, 10000000);


////Notification start

            navigator.serviceWorker.register('sw.js');
  Notification.requestPermission(function(result) {
    if (result === 'granted') {
      navigator.serviceWorker.ready.then(function(registration) {
        registration.showNotification('New message', {
          body: 'A new message has been made!',
          icon: '/logos/ico_png.png',
          badge: '/logos/ico_png.png',
          vibrate: [200, 100, 200, 100, 200, 100, 200],
          tag: 'vibration-sample',
          target: 'https://www.example.com/'
        });     
      });  
    }
  });   

////Notification ends

}

      }
    });
    }



    $(document).ready(function() {


    setInterval("function_update()",5000); //call function every 5 seconds.



});
</script>

以下是服务工作者文件的内容＆＃39; sw.js＆＃39;

self.addEventListener('notificationclick', function(event) {
    let url = 'index.php';
    event.notification.close(); // Android needs explicit close.
    event.waitUntil(
        clients.matchAll({type: 'window'}).then( windowClients => {
            // Check if there is already a window/tab open with the target URL
            for (var i = 0; i < windowClients.length; i++) {
                var client = windowClients[i];
                // If so, just focus it.
                if (client.url === url && 'focus' in client) {
                    return client.focus();
                }
            }
            // If not, then open the target URL in a new window/tab.
            if (clients.openWindow) {
                return clients.openWindow(url);
            }
        })
    );
});