Debug front-end Ajax

The reason for this article is thanks to holmesian. Thanks to the guidance of holmesian

Debug front-end AjaxProgram. There will always be a time processing function in Ajax, and there will be a backend program in it.
In this way, we can directly access this program and pass values through parameters. In this way, we can intuitively see that the data returned by XML is directly debugged.

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Experience:
1. the browser caches program results.
2. If the returned results are not displayed, directly view the declared XML format. Display the returned results in normal HTML format. If the result is not displayed, check your program.
3. If the error is not displayed except for Chinese characters, it indicates that the encoding is incorrect, specify charset =.