Document.body vs document.getElementsByTagName('body')[0]

JavaScript performance comparison

Revision 3 of this test case created by Dennis

Preparation code

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

Preparation code output

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Testing in unknown unknown
Test Ops/sec
document.body
var body = document.body;
pending…
document.getElementsByTagName('body')[0]
var body2 = document.getElementsByTagName('body')[0];
pending…
$('body')
var body3 = $('body');
pending…
$(document.body)
var body4 = $(document.body);
pending…

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