querySelector vs querySelectorAll vs getElementById vs getElementsByClassName vs getElementsByTagName

JavaScript performance comparison

Revision 25 of this test case created by

Preparation code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

<p id="foo" class="foo">
  <span id="1">,,,</span>
  <span id="2">,,,</span>
  <span id="3">,,,</span>

  <span class="bar">,,,</span>
</p>
    

Preparation code output

<p id="foo" class="foo"> <span id="1">,,,</span> <span id="2">,,,</span> <span id="3">,,,</span> <span class="bar">,,,</span> </p>

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
querySelector
document.querySelector("#foo").querySelector("#2");
pending…
querySelectorAll
document.querySelectorAll("#foo").querySelectorAll("#2");
pending…
getElementById
Array.prototype.forEach.call(document.getElementById("foo").getElementsByTagName('span'), function(item){ if(item.id === "2") return item;})
pending…
getElementsByClassName
$("#foo").find("#2")
pending…

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Revisions

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