<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<button>sssss</button>
<script src="https://cdn.bootcss.com/jquery/1.12.0/jquery.js"></script>
<script type="text/javascript">
var i=1;
$("button").click(function(){
send(i);
i++;
})
var currentRequests = {};
$.ajaxPrefilter(function( options, originalOptions, jqXHR ) {
if ( currentRequests[ options.url ] ) {
jqXHR.abort();
}
});
function send(da) {
console.log(i)
var url='urls.json'
$.ajax({
url: url,
type: 'GET',
cache:false,
dataType: 'json',
beforeSend :function(){
currentRequests[url]=true;
},
success:function(data){
currentRequests[url]=undefined;
}
});
}
</script>
</body>
</html>