网页title标题的闪动效果

通过网页title来提示用户有新消息这个功能很常见，比如现在的微博，还有一些邮箱，这个功能都很常见。

 显示信息数:
 <input type="text" id="textMsgs"/>
 <button title="开始闪动" onclick="flashTitle('您有' + document.getElementById('textMsgs').value + '条新信息');">开始闪动</button>
 <button title="停止闪动" onclick="stopFlash();">停止闪动</button>

 var flashTitlePlayer = {
         start: function (msg) {
             this.title = document.title;
             if (!this.action) {
                 try {
                     this.element = document.getElementsByTagName('title')[0];
                     this.element.innerHTML = this.title;
                     this.action = function (ttl) {
                         this.element.innerHTML = ttl;
                     };
                 } catch (e) {
                     this.action = function (ttl) {
                         document.title = ttl;
                     }
                     delete this.element;
                 }
                 this.toggleTitle = function () {
                     this.action('【' + this.messages[this.index = this.index == 0 ? 1 : 0] + '】来到博客园！');
                 };
             }
             this.messages = [msg];
             var n = msg.length;
             var s = '';
             if (this.element) {
                 var num = msg.match(/\w/g);
                 if (num != null) {
                     var n2 = num.length;
                     n -= n2;
                     while (n2 > 0) {
                         s += " ";
                         n2--;
                     }
                 }
             }
             while (n > 0) {
                 s += '　';
                 n--;
             };
             this.messages.push(s);
             this.index = 0;
             this.timer = setInterval(function () {
                 flashTitlePlayer.toggleTitle();
             }, 1000);
         },
         stop: function () {
             if (this.timer) {
                 clearInterval(this.timer);
                 this.action(this.title);
                 delete this.timer;
                 delete this.messages;
             }
         }
     };
     function flashTitle(msg) {
         flashTitlePlayer.start(msg);
     }
     function stopFlash() {
         flashTitlePlayer.stop();
     }