รบกวนผู้รู้ เรื่อง notification desktop ทำตามแล้ว ติดปัญหา ครับ

notify('http://cdn.sstatic.net/stackexchange/img/logos/so/so-icon.png','หัวข้อ','รายละเอียด');
		function notify(icon,title,body) {
		  if (!("Notification" in window)) {
			alert("This browser does not support desktop notification");
		  }else if (Notification.permission === "granted") {
			var notification = new Notification(title,{
			icon: icon,
			body: body
			});
			var i=1;
			setTimeout(function () {
				notification.close();
			}, '10000');
			 notification.onclick = function () {   
                notification.close();
             }
		  }else if (Notification.permission !== 'denied') {
			Notification.requestPermission(function (permission) {
				if(!('permission' in Notification)) {
					Notification.permission = permission;
				}
			  if (permission === "granted") {
				var notification = new Notification("Hi there!");
			  }
			});
		  }
		}