Detailed explanation of the Stopwatch function instance tutorial implemented with JavaScript-JS Tutorial-php.cn

Detailed explanation of the Stopwatch function instance tutorial implemented with JavaScript

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Release： 2017-06-15 13:23:16

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This article mainly introduces the StopWatch function implemented by Javascript, and analyzes the related operating techniques of customizing StopWatch in Javascript to implement the test running time function based on specific examples. Friends in need can refer to the following

Examples of this article StopWatch function implemented in Javascript. Share it with everyone for your reference, the details are as follows:

Sometimes js is needed to write some functions for testing. If you need to test the execution time, you may need a stopwatch:

StopWatch class:

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);
};

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Usage example (test Fibonacci sequence):

<!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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The running effect is as follows ：

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