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(测试斐波那契数列):
var sw = new stopWatch().Start();
(function f(n){return n == 1 || n == 2 ? 1 : f(n-1)+f(n-2);})(45);
alert(sw.Seconds());