getElementById vs. querySelector

JavaScript performance comparison

Revision 60 of this test case created

Info

Compare the speed of getElementById to querySelector

Preparation code

<script src="//code.jquery.com/jquery-2.0.3.min.js"></script>
<p id="foo">Foo</p>
<p id="bar" class="bar" data-role="foo">Bar</p>
<p id="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("[data-role]");
pending…
Class
var bar = document.getElementsByClassName("bar");
pending…
jQuery Class
var bar = $('.bar');
pending…
jQuery attr
var bar = $('[data-role]');
pending…

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