<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>jquery promise</title>
</head>
<body>
<div id="app">
<div id="result"></div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script>
$(‘#result‘).html(‘waiting data...‘);
var promise = wait();
promise.done(result);
function result() {
$(‘#result‘).html(‘done‘);
}
function wait() {
var deferred = $.Deferred();
setTimeout(function() {
deferred.resolve();
}, 2000);
return deferred.promise();
}
</script>
</body>
</html>
原文：http://www.cnblogs.com/bldf/p/6760192.html