function stopWatch() {
}
stopWatch.prototype.Start = function () {
this.startD = new Date();
return this;
};
stopWatch.prototype.Stop = function () {
this.startD = new Date();
return this;
};
stopWatch.prototype.Seconds = function () {
return Math.abs((new Date() - this.startD) / 1000);
};
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>StopWatch</title>
</head>
<body>
<script >
function stopWatch() {
}
stopWatch.prototype.Start = function () {
this.startD = new Date();
return this;
};
stopWatch.prototype.Stop = function () {
this.startD = new Date();
return this;
};
stopWatch.prototype.Seconds = function () {
return Math.abs((new Date() - this.startD) / 1000);
};
var sw = new stopWatch().Start();
(function f(n){return n == 1 || n == 2 ? 1 : f(n-1)+f(n-2);})(45);
alert(sw.Seconds());
</script>
</body>
</html>
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