How does jquery determine whether a css file exists?

Judgment method: First introduce the "jquery.js" file; then create a click event for the button; finally use the "$.ajax()" method in the click event to request the css resource file, based on the http status code Judgment, if the returned status code is 200, the css file exists, if it is 404, it does not exist.

The operating environment of this tutorial: windows7 system, jquery1.12.0 version, Dell G3 computer.

jquery determines whether the css file exists

<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>

Description:

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

Recommended related tutorials: jQuery Tutorial (Video)

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