getElementById vs. querySelector

JavaScript performance comparison

Revision 141 of this test case created by

Preparation code

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

    

Preparation code output

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

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
getElementById
var bar = document.getElementById("bar");
pending…
querySelector (class)
var bar = document.querySelector(".foo");
pending…
OP method (class)
var els = document.getElementsByClassName('.foo');
if(els || els.length > 0) {
    var bar = els[0];
}
pending…

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Revisions

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Foo

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