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Run results for:
.getElementsByClassName() vs. .querySelectorAll()
Show the performance impact of a live node list (.getElementsByClassName()) vs. a static node list (.querySelectorAll()).
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=621089" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:140.0) Gecko/20100101 Firefox/140.0
Browser:
Firefox 140
Operating system:
Windows
Device Platform:
Desktop
Date tested:
7 months ago
Test name
Executions per second
.getElementsByClassName()
52801.7 Ops/sec
.querySelectorAll()
2327489.2 Ops/sec
HTML Preparation code:
<div class="foo">test</div> <div class="bar">test</div> <div class="foo">test</div> <div class="bar">test</div> <div class="foo">test</div> <div class="bar">test</div> <div class="foo">test</div> <div class="bar">test</div> <div class="foo">test</div> <div class="bar">test</div>
Tests:
.getElementsByClassName()
Array.from(document.getElementsByClassName("foo")).forEach(item => {if(item.textContent === "test"){console.log("match")}});
.querySelectorAll()
document.querySelectorAll("foo").forEach(item => {if(item.textContent === "test"){console.log("match")}});