querySelector vs. getElementsByClassName

JavaScript performance comparison

Revision 195 of this test case created by dan

Preparation code

<p id="foo">Foo</p>
<p id="bar">Bar</p>
<p id="baz">Baz</p>
<p class="foo">Foo</p>
<p class="bar">Bar</p>
<p class="bar">Bar</p>
<p class="bar">Bar</p>
<p class="bar">Bar</p>
<p class="bar">Bar</p>
<p class="bar">Bar</p>
<p class="bar">Bar</p>
<p class="bar">Bar</p>
<p class="baz">Baz</p>

    

Preparation code output

<p id="foo">Foo</p> <p id="bar">Bar</p> <p id="baz">Baz</p> <p class="foo">Foo</p> <p class="bar">Bar</p> <p class="bar">Bar</p> <p class="bar">Bar</p> <p class="bar">Bar</p> <p class="bar">Bar</p> <p class="bar">Bar</p> <p class="bar">Bar</p> <p class="bar">Bar</p> <p class="baz">Baz</p>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
getElementsByClassName()[0]
var bar = document.getElementsByClassName("baz");
pending…
querySelector
var bar = document.querySelector(".baz");
pending…

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Revisions

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