title: jQuery animate complete not working
body: <p>The animation itself is working but why isn't my complete function working?</p>
  
  <p>fiddle: <a href="https://jsfiddle.net/jzhang172/5kfbw066/1/" rel="nofollow">https://jsfiddle.net/jzhang172/5kfbw066/1/</a></p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>$(".ok").animate({
  height:"300px"
  
  },{
   duration:2000
   }, {complete:function(){
  alert('hey');
  }
  });</code></pre>
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.ok{
    background:blue;
    height:100px;
    width:200px;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;
  &lt;div class="ok"&gt;&lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>