If the asynchronous result you're waiting for comes back, make the DOM changes necessary to display it, and then remember that you processed the result.

如果等待的异步结果返回了，对DOM作必要的修改并显示然后再处理结果。

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Ajax, as the Web development community well knows, allows you to make asynchronous auxiliary requests to the server and display the resulting output directly on the Web page (see Figure 4).

Web开发社区的人都知道，Ajax允许向服务器发出异步的辅助请求，并直接在网页中显示结果(如图4所示)。

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Updatemessage - display the status message (for example, "Please Wait...") during the asynchronous server validation call.

updatemessage—在异步服务器验证调用期间显示状态消息比如，“Please wait…”。

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