jq ajaxPrefilter 防止重复提交ajax

<!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>

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jq ajaxPrefilter 防止重复提交ajax

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