How does jq determine whether css exists?

The method for jq to determine whether css exists: first open the corresponding code file; then request the css resource file through ajax; finally, judge based on the http status code, the code is such as "$("#btn" ).click(function(){...}".

The operating environment of this tutorial: windows7 system, jquery1.12.0 version, this method is applicable to all Brand computer.

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jquery determines whether the css file exists

mainly uses ajax , by requesting the css resource file and judging based on the http status code. If the status code is 200, it exists, if it is 404, it does not exist.

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