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we discovered that calling getelementsbytagname('DIV') is a way faster than queryselectorall('DIV') http://www.nczonline.net/blog/2010/09/28/why-is-getelementsbytagname-faster-that-queryselectorall
the reason being that the former returns an HTMLCollection (live list) and the later a NodeList (static list). To go further we will see if accessing properties of a static list compensates the time to create it
Revision 9: However when making a more complex query (typical use of querySelectorAll), using getElementsByTagName and making the filtering by code is still slower than using querySelectorAll.
<div>
<ul>
<li><a href="#1">item 1</a></li>
<li><a href="#2">item 2</a></li>
<li><a href="#1">item 3</a></li>
<li><a href="#2">item 4</a></li>
<li><a href="#1">item 5</a></li>
<li><a href="#2">item 6</a></li>
<li><a href="#1">item 7</a></li>
<li><a href="#2">item 8</a></li>
<li><a href="#1">item 9</a></li>
<li><a href="#2">item 10</a></li>
<li><a href="#1">item 11</a></li>
<li><a href="#2">item 12</a></li>
<li><a href="#1">item 13</a></li>
<li><a href="#2">item 14</a></li>
<li><a href="#1">item 15</a></li>
<li><a href="#2">item 16</a></li>
<li><a href="#1">item 17</a></li>
</ul>
</div>
Ready to run.
Test | Ops/sec | |
---|---|---|
querySelectorAll |
| ready |
getElementsByTagName |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.