Run results for: Get elements by class: jQuery vs querySelectorAll vs getElementsByClassName (jQuery 1.x)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36

Browser: Chrome 66

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
jQuery 1.12.4	590212.2 Ops/sec
querySelectorAll	859767.0 Ops/sec
getElementsByClassName	4527008.0 Ops/sec
jQuery 1.12.4: mixed selector	280404.4 Ops/sec
querySelectorAll: mixed selector	683166.5 Ops/sec

HTML Preparation code:

<script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>

<ul id="theList">
  <li class="odd">Item 1</li>    
  <li class="even">Item 2</li>    
  <li class="odd">Item 3</li>    
  <li class="even">Item 4</li>    
  <li class="odd">Item 5</li>    
  <li class="even">Item 6</li>    
  <li class="odd">Item 7</li>    
  <li class="even">Item 8</li>    
  <li class="odd">Item 9</li>    
  <li class="even">Item 10</li>    
  <li class="odd">Item 11</li>    
  <li class="even">Item 12</li>    
  <li class="odd">Item 13</li>    
  <li class="even">Item 14</li>    
  <li class="odd">Item 15</li>    
  <li class="even">Item 16</li>    
  <li class="odd">Item 17</li>    
  <li class="even">Item 18</li>    
  <li class="odd">Item 19</li>    
  <li class="even">Item 20</li>    
  <li class="odd">Item 21</li>    
  <li class="even">Item 22</li>    
  <li class="odd">Item 23</li>    
  <li class="even">Item 24</li>    
  <li class="odd">Item 25</li>    
  <li class="even">Item 26</li>    
  <li class="odd">Item 27</li>    
  <li class="even">Item 28</li>    
  <li class="odd">Item 29</li>    
  <li class="even">Item 30</li>    
</ul>

Tests:

jQuery 1.12.4
var els = $('.even');
querySelectorAll
var els = document.querySelectorAll('.even');
getElementsByClassName
var els = document.getElementsByClassName('even');
jQuery 1.12.4: mixed selector
var els = $('li.even');
querySelectorAll: mixed selector
var els = document.querySelectorAll('li.even');

Run results for: Get elements by class: jQuery vs querySelectorAll vs getElementsByClassName (jQuery 1.x)

Compare various methods of obtaining a group of elements identified by class name

jQuery 1.12.4

querySelectorAll

getElementsByClassName

jQuery 1.12.4: mixed selector

querySelectorAll: mixed selector