Basic Ajax example

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Empty Night</title>
</head>
<body>
    <div id="ajax-app"></div>
    
    <script src="https://code.jquery.com/jquery-2.1.4.js"></script>
    <script src="code.js"></script>
</body>
</html>
    

https://code.jquery.com/jquery-2.1.4.js