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koizuss/js-function-measurement.html

Created June 16, 2013 14:03
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即時関数の処理速度測定
Raw
js-function-measurement.html
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>js-function-measurement</title>
</head>
<body>
<style type="text/css">
dd {position: relative; width: 250px;}
[id^=item] { font-weight: bold; position: absolute; right: 0;}
</style>
<dl>
<dd>(function ... : <span id="item1"></span></dd>
<dd>!function ... : <span id="item2"></span></dd>
<dd>+function ... : <span id="item3"></span></dd>
<dd>-function ... : <span id="item4"></span></dd>
<dd>void function ... : <span id="item5"></span></dd>
<dd>typeof function ... : <span id="item6"></span></dd>
<dd>var xxx = function ... : <span id="item7"></span></dd>
</dl>
<script type="text/javascript">
var showTimestamp = function(start, stop) {
stop = stop || new Date();
return function(target) {
document.getElementById(target).innerHTML = '' + (stop - start) + 'ms';
};
}
, functions = [
function(start) {
(function() {
showTimestamp(start)('item1');
})();
// ダミー
}
, function(start) {
(function() {
showTimestamp(start)('item1');
})();
}
, function(start) {
!function() {
showTimestamp(start)('item2');
}();
}
, function(start) {
+function() {
showTimestamp(start)('item3');
}();
}
, function(start) {
-function() {
showTimestamp(start)('item4');
}();
}
, function(start) {
void function() {
showTimestamp(start)('item5');
}();
}
, function(start) {
typeof function() {
showTimestamp(start)('item6');
}();
}
, function(start) {
var func = function() {
showTimestamp(start)('item7');
};
func();
}
];
for(var i = 0; i < functions.length; i++) {
var start = new Date();
for(var j = 0; j < 9999; j++) {
functions[i](start);
}
}
</script>
</body>
</html>
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