动态按钮：指网页中的一些按钮，当鼠标悬停、按下和弹出时会出现不同颜色或音效，形成一种动态效果。
某些时候动态HTML页面需要即时从服务器更新以备随时显示-甚至是使用后退按钮的时候.例如 显示银行帐号的状态或在线订单.
Sometimes dynamic HTML pages need to be fetched from the server whenever they are displayed - even when the back button is used. For example, pages showing the state of a bank account or online order.
动态 UI 的最简单形式是使不可用的菜单项或按钮变灰的 UI。
The simplest form of dynamic UI is one that grays out menu items or buttons that are unavailable.
在对数据库执行选择操作后返回的所有行都是按照这种方法处理的，这样每次按下Show All按钮或装载页面时即可动态创建HTML选择列表。
All rows returned from a select of the database are processed this way, which allows for the dynamic creation of the HTML select list every time the Show all button is clicked or the page is loaded.
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