innerHTML vs removeChild/appendChild
JavaScript performance comparison
Info
what method for empty a element is faster ?
Preparation code
<div id="container">
</div>
<script>
Benchmark.prototype.setup = function() {
var content = 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span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span><span>a</span>';
var contentDOM = [];
for (var counter = 0; counter < 2000; counter++){
var span = document.createElement('span');
span.innerText = 'a';
contentDOM.push(span);
}
var cont = document.getElementById('container');
cont.innerHTML = content;
function refill() {
cont.innerHTML = content;
}
function refillRemoveChild() {
while (cont.lastChild) {
cont.removeChild(cont.lastChild);
}
cont.innerHTML = content;
}
function refillRemoveChildAndAppendChild() {
while (cont.lastChild) {
cont.removeChild(cont.lastChild);
}
for (counter = 0; counter < 2000; counter++){
cont.appendChild(contentDOM[counter]);
}
}
};
</script>
Preparation code output
Test runner
Warning! For accurate results, please disable Firebug before running the tests. (Why?)
Java applet disabled.
Test  Ops/sec  

Refill with innerHTML 

pending… 
Refill with removeChild before innerHTML 

pending… 
refill with remove child and then append child 

pending… 
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Revisions
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 Revision 1: published by Ali Mihandoost
 Revision 2: published by Ali Mihandoost
 Revision 5: published by XP1
 Revision 6: published
 Revision 7: published
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 Revision 14: published by Philip O'Brien
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