querySelectorAll versus getElementById + getElementsByTagName

JavaScript performance comparison

Revision 2 of this test case created

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

<div id="foo">
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
</div>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
querySelectorAll
var divs = document.querySelectorAll('#foo > div');
pending…
getElementById + getElementsByTagName
var foo = document.getElementById('foo').getElementsByTagName('div');
pending…

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Revisions

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