getElementById vs getElementsByClassName vs querySelector (v6)

Revision 6 of this benchmark created by PAEz on

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

Test runner

Ready to run.

Testing in
TestOps/sec
getElementById
for (var i = 1; i <= 30; i++) {
  var x = document.getElementById("id" + i);
};
ready
getElementsByClassName
for (var i = 1; i <= 30; i++) {
  var x = document.getElementsByClassName("class" + i)[0];
};
ready
querySelector class
for (var i = 1; i <= 30; i++) {
  var x = document.querySelector(".class" + i);
};
ready
querySelector id
for (var i = 1; i <= 30; i++) {
  var x = document.querySelector("#id" + i);
};
ready
querySelector class2
for (var i = 1; i <= 30; i++) {
  var x = document.querySelector("div.class" + i);
};
ready

Revisions

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