getElementById vs. getElementsByClassName vs. querySelector vs. jQuery

JavaScript performance comparison

Revision 17 of this test case created

Info

Compare the speed of getElementById to getElementsByClassName to querySelector to jQuery returns of each of those selectors.

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<p id="foo" class="my-foo">Foo</p>
<p id="bar" class="my-bar">Bar</p>
<p id="baz" class="my-baz">Baz</p>

Preparation code output

Foo

Bar

Baz

Test runner

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

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
getElementById
var bar = document.getElementById("bar");
pending…
querySelector
var bar = document.querySelector("#bar");
pending…
getElementsByClassName
var bar = document.getElementsByClassName("my-bar");
pending…
jQuery ID Selector
var bar = $("#bar");
pending…
jQuery Class Selector
var bar = $(".my-bar");
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