在Firefox装载页面时，您可以检查Firefox将哪种MIME类型与这个页面关联起来。

You can always check the MIME type that Firefox associates with a page once it loads the page.

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read _ file函数使用stat函数调用检查文件的修改时间，只有在上一次装载之后修改了文件的情况下，它才重新读取文件的内容。

The read_file function USES the stat function call to check the modification time of the file, only re-reading the contents of the file if it changed since the last time the file was loaded.

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在调用服务器之前，检查所需的数据是否已经装载了；如果是这样，就跳过调用。

Before calling the server, check if the needed data is already loaded and if so, skip the call.

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