Posted in Javascript onJune 13, 2017
本文实例讲述了Javascript实现的StopWatch功能。分享给大家供大家参考,具体如下:
有时会需要js来写一些函数进行测试,如果需要测试执行时间,可能需要一个stopwatch:
StopWatch类:
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); };
用法示例(测试斐波那契数列):
<!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>
运行效果图如下:
希望本文所述对大家JavaScript程序设计有所帮助。
Javascript实现的StopWatch功能示例
- Author -
_iorilan声明:登载此文出于传递更多信息之目的,并不意味着赞同其观点或证实其描述。
Reply on: @reply_date@
@reply_contents@