javascript .getElementById() vs local var element

Benchmark created by ThinkingStiff on October 26, 2011

Preparation HTML

<div class="class1" id="id1"></div>
<div class="class2" id="id2"></div>
<div class="class3" id="id3"></div>
<div class="class4" id="id4"></div>
<div class="class5" id="id5"></div>
<div class="class6" id="id6"></div>
<div class="class7" id="id7"></div>
<div class="class8" id="id8"></div>
<div class="class9" id="id9"></div>
<div class="class10" id="id10"></div>

<div class="class11" id="id11"></div>
<div class="class12" id="id12"></div>
<div class="class13" id="id13"></div>
<div class="class14" id="id14"></div>
<div class="class15" id="id15"></div>
<div class="class16" id="id16"></div>
<div class="class17" id="id17"></div>
<div class="class18" id="id18"></div>
<div class="class19" id="id19"></div>
<div class="class20" id="id20"></div>


<div class="class21" id="id21"></div>
<div class="class22" id="id22"></div>
<div class="class23" id="id23"></div>
<div class="class24" id="id24"></div>
<div class="class25" id="id25"></div>
<div class="class26" id="id26"></div>
<div class="class27" id="id27"></div>
<div class="class28" id="id28"></div>
<div class="class29" id="id29"></div>
<div class="class30" id="id30"></div>

Test runner

(function() {
document.getElementById( 'id16' ).style.display = 'inline-block';
document.getElementById( 'id16' ).style.height = '10px';
document.getElementById( 'id16' ).style.width = '10px';
document.getElementById( 'id16' ).style.backgroundColor = 'red';
document.getElementById( 'id16' ).style.color = 'white';
document.getElementById( 'id16' ).style.fontSize = '10px';
document.getElementById( 'id16' ).style.lineHeight = '12px';
document.getElementById( 'id16' ).style.cursor = 'pointer';
})();

(function() {
var element = document.getElementById( 'id16' );
element.style.display = 'inline-block';
element.style.height = '10px';
element.style.width = '10px';
element.style.backgroundColor = 'red';
element.style.color = 'white';
element.style.fontSize = '10px';
element.style.lineHeight = '12px';
element.style.cursor = 'pointer';
})();

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

• Revision 1: published by ThinkingStiff on October 26, 2011