ID Test

JavaScript performance comparison

Revision 3 of this test case created

Preparation code

<div><span><b><a href="#">test <i>foo</i></a></b></span><span><b><a href="#">test <i>foo</i></a></b></span><div id="foo" class="foo"><div id="bar" class="bar"></div></div><span><b><a href="#">test <i>foo</i></a></b></span></div>

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
 
<script>
Benchmark.prototype.setup = function() {
    var fooContext = $('#foo');
};
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
Just ID
$('.foo');
pending…
Just ID 2
$('#bar');
pending…
Nested
$('#bar', fooContext);
pending…
Nested Selector
fooContext.find('#bar');
pending…
Nested Selector 2
$('.foo .bar');
pending…
By Class
$('.bar');
pending…
By Class Nested
$('.bar', fooContext);
pending…
By Class Nested 2
fooContext.find('.bar');
pending…

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