getElementById vs. querySelector

JavaScript performance comparison

Revision 51 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 src="//cdnjs.cloudflare.com/ajax/libs/zepto/1.0/zepto.min.js"></script>
<script>
Benchmark.prototype.setup = function() {
    var $$ = {
       id:function(e){
        return [document.getElementById(e)];
       },
       class : function(e){
        return document.getElementsByClassName(e);
       }
    };
   
};
</script>

Preparation code output

Foo

Bar

Baz

Test runner

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Testing in unknown unknown
Test Ops/sec
getElementById
var bar = document.getElementById("#bar");
pending…
querySelector
var bar = document.querySelector("#bar");
pending…
easySyntax
var bar = $$.id("bar");
pending…
Zepto
var bar = $("#bar");
pending…

Compare results of other browsers

Revisions

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