JS p页被加载时，它就调用action类，这个类在MVC设计模式中充当控制器角色。
When the JSP page is loaded, it calls the Action class, which ACTS as a Controller in the MVC design pattern.
仅当目标是Windows窗体设计器时才使用Windows窗体页上的定时器控件。
Use the timer control that is located under the Windows Forms tab only if the target is a Windows Forms designer.
作为提醒，“设计页”应该打开浏览器在单独使用的互动窗口，在办理这些笔记。
As a reminder, the "design page" should be opened in a separate browser window and used interactively while going through these notes.
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