If a valid response can be found in the browser cache, the browser displays the content to the end user without sending a request to the network.

如果可以在浏览器缓存中找到有效的响应，浏览器将不向网络发送请求，而直接将此内容向最终用户显示。

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If these are static HTML files, then the response containing all the static content comes from the Web server without hitting the application server again.

如果它们是静态HTML文件，那么响应包含来自Web服务器的所有静态内容，而不用再次打扰应用服务器。

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If a callback function was provided, the send method of the XHR object returns immediately without waiting for a server response.

如果提供了回调函数，那么XHR对象的send方法立即返回，并不等待服务器响应。

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