Sense.  It makes a difference if you run an old javascript file before loading its new replacement and running that.  As in,<p>Original script:<p><pre><code>  &lt;script&gt;
    location.href=&quot;http:&#x2F;&#x2F;google.com&quot;;
  &lt;&#x2F;script&gt;

</code></pre>
New script<p><pre><code>  &lt;script&gt;
    &#x2F;&#x2F; oops!  forgot to remove this
    &#x2F;&#x2F; location.href=&quot;http:&#x2F;&#x2F;google.com&quot;;
  &lt;&#x2F;script&gt;

</code></pre>
You&#x27;ll want to make sure you have the right version in place before you try to run either of them.