getElementsByClassName VS querySelectorAll

JavaScript performance comparison

Revision 51 of this test case created

Info

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

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js">
</script>
<div>
  <ul id="id">
    <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>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
getElementsByClassName
nodes = document.getElementsByClassName('classname');
pending…
querySelectorAll
nodes = document.querySelectorAll('[class = classname]');
pending…
jQuery $(.class)
nodes = $(".classname");
pending…
querySelectorAll (2)
nodes = document.querySelectorAll('.classname');
pending…
jquery('tag.class')
nodes = $("a.classname");
pending…
querySelectorAll (3)
nodes = document.querySelectorAll('tag.classname');
pending…
TagName > filter by className
nodes = document.getElementsByTagName('a');
newnodes = [];
for (var i = 0; i < nodes.length; i++) {
  if (nodes[i].getAttribute('class') === 'classname') {
    newnodes.push(nodes[i]);
  }
}
pending…
querySelectorAll (3) with id
nodes = document.querySelectorAll('#id .classname');
pending…
jquery with id and class
nodes = $("#id .classname");
pending…
jquery with find
nodes = $("#id").find(".classname");
pending…

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