处理页面的内容、表示或导航。
Manipulating the content, presentation, or navigation of a page.
为了处理页面缓存，我必须先解决所有的差异。
In order to handle page caching, I must deal with all of the differences.
扩展Page的每个类还可以包含处理页面事件的方法。
Each class that extends page might also contain methods that handle events on the page.
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