Browser Diet - DOM Manipulation

JavaScript performance comparison

Revision 11 of this test case created

Preparation code

<div id="myList"></div>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
DOM manipulation every iteration
var myList = document.getElementById("myList");

for (var i = 0; i < 100; i++) {
  myList.innerHTML += "<span>" + i + "</span>";
DOM manipulation after all iterations
var myList = "";

for (var i = 0; i < 100; i++) {
  myList += "<span>" + i + "</span>";

document.getElementById("myList").innerHTML = myList;
DOM manipulation after caching innerHTML
var myListHTML = document.getElementById("myList").innerHTML;

for (var i = 0; i < 100; i++) {
  myListHTML += "<span>" + i + "</span>";

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zechau commented :

the last code -- DOM manipulation after caching innerHTML, does not work, cause it dose pass the value to innerHTML of the operated element.

zechau commented :

correct: pass -> dosen't pass

Jimmy James commented :

Like zechau said, the last one doesn't work. The only thing you're doing is appending text to a string. No DOM manipulation at all.. No wonder is quicker.

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