querySelector vs querySelectorAll vs getElementById vs getElementsByClassName vs getElementsByTagName

JavaScript performance comparison

Revision 25 of this test case created

Preparation code

<script src="//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

,,, ,,, ,,, ,,,

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in unknown unknown
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…

Compare results of other browsers

Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

0 comments

Add a comment