How to determine if a file exists with jquery

The jquery method to determine whether a file exists: first encapsulate a fileExists method and receive url parameters; then use the [$.ajax()] method to send a request and set a synchronous request; and finally return the request result.

The operating environment of this tutorial: windows7 system, jquery3.2.1 version, thinkpad t480 computer.

Related free learning recommendations: javascript (video), jQuery tutorial (video )

Jquery method to determine whether a file exists:

js or jquery determines whether a file exists, you need to use ajax

Usagevar Exists=Exists('/cache/view_num/' uid '.txt');if(Exists){}

 function fileExists(url){
var isExists;
$.ajax({
url:url,
async:false,
type:'HEAD',
error:function(){
isExists=0;
},
success:function(){
isExists=1;
}
});
if(isExists==1){
return true;
}else{
return false;
}
}

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