When a JQM application switches from one page to the next, the primary activity that takes place is that the content div is swapped out for the new page's content.

当JQM应用程序从一个页面切换到下一个页面时，发生的主要动作就是内容div中的内容会换成新页面的内容。

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Dictate that all pages maintain their content in one of four div elements: a div for the header, one for the footer, one for navigation, and one for content.

指明所有页面在下列四个div元素之一中维护其内容：一个div用于页眉，一个用于页脚，一个用于导航，一个用于内容。

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Each widget is a div element of class type widget, which has a header (widget-head) and content area (widget-content).

每个小部件都是类类型为widget的一个div元素，具有头部(widget - head)和内容区(widget - content)。

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