$(this).attr('id') vs this.id

JavaScript performance comparison

Revision 2 of this test case created by Addy Osmani

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>
<a id="tester" class="tests" href="#">abcdefghijkl</a>

<script>
  $a = $('.tests');
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
$(this).attr('id');
$a.each(function(index){
     $t = $(this).attr('id');
});
pending…
$(this).id
$a.each(function(index){
     $t = this.id;
});
pending…

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2 comments

Kuntau commented :

yikesssssss... maxthon the fasted here :p firefox has proven it again as the slowest sluggish browser ever :)

sandeep commented :

wow...

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