var timer = null,  title = $('title').text();  $('body').on('click', function() {  clearInterval(timer);  $('title').text(title);  });  function showMsgNotification(title, msg , iconUrl ,clickUrl) {  var Notification = window.Notification || window.mozNotification || window.webkitNotification;  if (window.webkitNotifications) {  //chrome老版本  if (window.webkitNotifications.checkPermission() == 0) {  var notif = window.webkitNotifications.createNotification(iconUrl, title, msg);  notif.display = function() {setTimeout(function() {notif.close();}, 5000);}  notif.onerror = function() {}  notif.onclose = function() {}  notif.onclick = function() {window.focus();window.location.href = clickUrl;}  notif.replaceId = 'Meteoric';  notif.show();  } else {  window.webkitNotifications.requestPermission($jy.notify);  }  }else if(Notification) {//支持桌面通知  if(Notification.permission == "granted") {//已经允许通知  var instance = new Notification(title, {  body: msg,  icon: iconUrl //renotify : true
                        });  instance.onclick = function() {  //$('body').css({'background': 'red'});  //console.log('onclick');
                            window.focus();window.location.href = clickUrl;//window.open(clickUrl, "_blank");
                        };  instance.onerror = function() {  //console.log('onerror');
                        };  instance.onshow = function() {  setTimeout(function() {instance.close();}, 5000);};  instance.onclose = function() {  //console.log('onclose');
                        };  }else {//第一次询问或已经禁止通知(如果用户之前已经禁止显示通知，那么浏览器不会再次询问用户的意见，Notification.requestPermission()方法无效)  Notification.requestPermission(function(status) {  if (status === "granted") {//用户允许  var instance = new Notification(title, {  body: msg,  icon: iconUrl });  instance.onclick = function() {  window.focus();window.location.href = clickUrl;};  instance.onerror = function() {  // Something to do
                                };  instance.onshow = function() {  // Something to do
                                };  instance.onclose = function() {  // Something to do
                                };  }else {//用户禁止  return false; }  });  }  }else {//不支持(IE等)  var index = 0;      clearInterval(timer);  timer = setInterval(function() {  if(index%2) {  $('title').text('【　　　】'+ title);//这里是中文全角空格，其他不行  }else {  $('title').text('【快讯】'+ title);  }  index++;  if(index > 20) {  clearInterval(timer);  }  }, 500);  }  }