1. $和$$只能用于document，如果可以自己传入element参数就好了
2. Array和Enumerable的each方法，不可以使用调用类的this变量，如果可以有第三个参数作为调用类就好了
   

HTML is a technology that handles structure. CSS is a technology that handles decoration. Use them in right way and make your code better.
HTML, who knows it? The web server, the app server or the browser? Have you ever thought of this? Web server knows nothing. App server only knows Java, C# or other dynamic language code. That is browser who knows the HTML. So what we do is just to generate the HTML formated stream and send it to browser.

1. 使用Word进行文档写作能力
2. 使用Visio进行绘图能力
3. 英文交流能力：口头和邮件
4. 软件设计能力

这么多，哪天才能都掌握啊，一步一步来吧