title: Get the hash value which was before hashchange
body: <p>Suppose my html is</p>
  
  <pre><code>&lt;a href="#one"&gt;One&lt;/a&gt;
  &lt;a href="#two"&gt;Two&lt;/a&gt;
  </code></pre>
  
  <p>and Js is</p>
  
  <pre><code>$(window).on("hashchange"){
  alert(document.location.hash);
  }
  </code></pre>
  
  <p>I want to get the hash value which was before hash change .Is it Possible?If yes ,How?</p>