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<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-2.1.4.js"></script>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
​
</body>
</html>
 
var deferred = $.Deferred();
deferred.then(function(para){
  console.log(para);
  console.log('then function runs');
});
​
console.log('before function runs!');
setTimeout(function(){
  deferred.resolve('a');
}, 1000);
Output

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