getElementById vs. querySelector

JavaScript performance comparison

Revision 62 of this test case created

Info

Compare the speed of getElementById to querySelector

Preparation code

<p id="foo">Foo</p>
<p id="bar">Bar</p>
<p id="baz">Baz</p>
<script>
Benchmark.prototype.setup = function() {
    var param = '#foo';
    var res;
};
</script>

Preparation code output

Foo

Bar

Baz

Test runner

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Testing in unknown unknown
Test Ops/sec
1 if
if (param[0] == '#') {
  res = document.getElementById(param);
}
pending…
3 if
if (param.indexOf('#') == 0) {
  res = document.getElementById(param);
}
pending…

Compare results of other browsers

Revisions

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