Javascript 在浏览器上加载时有效，但当我将它放入 codepen 或 jsfiddle 时无效？

Question

Can anyone find out what this javascript isn't working? It works when i load it in chrome and firefox. I put it on codepen to show for a intern position but it's not working on codepen or jsfiddle, not sure why.

http://codepen.io/anon/pen/egpEG/

Answer 1

You should include jQuery to the fiddle or CodePen. You can add the following HTML code in your code pen:

<script src="http://code.jquery.com/jquery-2.1.0.min.js"></script>