getElementById vs. getElementsByClassName vs. querySelector vs. jQuery

JavaScript performance comparison

Revision 30 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

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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…

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Revisions

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