innerHTML vs removeChild vs replaceChild

JavaScript performance comparison

Revision 53 of this test case created by

Preparation code

<div style="width:1px;height:1px;overflow:hidden;">
<div id='box1'></div>
<div id='box2'></div>
<div id='box3'></div>
</div>
      
<script>
Benchmark.prototype.setup = function() {
  var testPattern = '<div>hello<div style="background-color: #000000;">ttt</div></div>';
  var i, testString;
  for (i = 0; i < 1000; i++) {
    testString += testPattern;
  }
  
  var box1 = document.getElementById('box1');
  var box2 = document.getElementById('box2');
  var box3 = document.getElementById('box3');
  
  box1.innerHTML = testString;
  box2.innerHTML = testString;
  box3.innerHTML = testString;
  
  function test1() {
    if (!box1) return;
    while (box1.firstChild) {
      box1.removeChild(box1.firstChild);
    }
    box1 = null;
  }
  
  function test2() {
    if (!box2) return;
    var parent = box2.parentNode;
    parent.removeChild(box2);
    box2.innerHTML = '';
    parent.appendChild(box2);
    box2 = null;
  }
  
  function test3() {
    if (!box3) return;
    var parent = box3.parentNode;
    parent.replaceChild(box3.cloneNode(false), box3);
    box3 = null;
  }

};
</script>

Preparation code output

<div style="width:1px;height:1px;overflow:hidden;"> <div id='box1'></div> <div id='box2'></div> <div id='box3'></div> </div>

Test runner

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Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
removeChild
test1();
pending…
innerHTML
test2();
pending…
replaceChild
test3();
pending…

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Revisions

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