getElementsByClassName VS querySelectorAll

JavaScript performance comparison

Revision 118 of this test case created by Andy Herron

Preparation code

<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>
    

Preparation code output

<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>

Test runner

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Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
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];
pending…
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];
pending…
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];
pending…

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