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benchmark.html
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benchmark.html
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<!DOCTYPE HTML>
<html>
<head>
<title>MutationObserver benchmark</title>
</head>
<body>
<div>
<span>Without observer: </span><span id="time1"></span><span> ms</span>
</div>
<div>
<span>With observer: </span><span id="time2"></span><span> ms</span>
</div>
<div id="mutations"></div>
<hr/>
<div id="holder-complex">
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div id="holder-complex-insertion-point"></div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<script src="lib/steal/steal.js"></script>
<script>
steal("jquery", "mutationobserver", function($, Observer) {
var complex = $("#holder-complex");
var insertion = $("#holder-complex-insertion-point");
var go = function() {
for (var i = 0; i < 1000; i++) {
insertion.append("<div>I'm fast</div>");
}
};
var withoutObserver = function() {
var start = new Date();
go();
var stop = new Date();
return stop - start;
};
var withObserver = function() {
var observer = new Observer(function(m) {
$("#mutations").html("I just saw " + m.length + " mutations");
});
observer.observe(complex[0], {
childList: true,
subtree: true
});
var start = new Date();
go();
var stop = new Date();
return stop - start;
};
// Run it without observers
$("#time1").html(withoutObserver());
insertion.html("");
// Run it with observers
$("#time2").html(withObserver());
});
</script>
</body>
</html>