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.

Recommended: "jquery video tutorial"

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.

<button id="btn">检测</button>
<script src="http://www.lingchenliang.com/download/jquery-1.12.0.min.js"></script>
<script>
$("#btn").click(function(){
    $.ajax({
        url: &#39;./main.css&#39;,
        type: &#39;GET&#39;,
        complete: function(response){
            if(response.status == 200){
                alert(&#39;有效&#39;);
            }else{
                alert(&#39;无效&#39;);
            }
        }
    });
});
</script>

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