getElementsByClassName VS querySelectorAll (v118)

Revision 118 of this benchmark created by Andy Herron on

Description

I wanted to see how well does jQuery performs on class selectors .. and boy, it was such a dissapointment

[edit] Accessed all elements of the array, since getElementsByClassName is a "live list" and doesn't actually calculate anything.

The previous tests are all skewed by this (although gEBCN is still a lot faster).

Preparation HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<div>
  <ul>
    <li>
      <a href="#" name="name" class="classname">item 1</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 2</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 3</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 4</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 5</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 6</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 7</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 8</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 9</a>
    </li>
    <li>
      <a href="#" name="name" class="classname">item 10</a>
    </li>
  </ul>
</div>
<script>
  var nodes;
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
jQuery $(.class)
var nodes = $(".classname");
var length = nodes.length;
var node1 = nodes[0];
var node2 = nodes[1];
var node3 = nodes[2];
var node4 = nodes[3];
var node5 = nodes[4];
var node6 = nodes[5];
var node7 = nodes[6];
var node8 = nodes[7];
var node9 = nodes[8];
var node10 = nodes[9];
ready
querySelectorAll
var nodes = document.querySelectorAll('.classname');
var length = nodes.length;
var node1 = nodes[0];
var node2 = nodes[1];
var node3 = nodes[2];
var node4 = nodes[3];
var node5 = nodes[4];
var node6 = nodes[5];
var node7 = nodes[6];
var node8 = nodes[7];
var node9 = nodes[8];
var node10 = nodes[9];
ready
getElementsByClassName
var nodes = document.getElementsByClassName("classname");
var length = nodes.length;
var node1 = nodes[0];
var node2 = nodes[1];
var node3 = nodes[2];
var node4 = nodes[3];
var node5 = nodes[4];
var node6 = nodes[5];
var node7 = nodes[6];
var node8 = nodes[7];
var node9 = nodes[8];
var node10 = nodes[9];
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.