【Javascript】時間の計測
参考
Date.prototype.getTime() - JavaScript | MDN
◼︎1秒間待つ
var time = new Date().getTime(); while (new Date().getTime() < time + 1000);
◼︎実行時間の計測に用いる
var end, start; start = new Date(); for (var i = 0; i < 1000; i++) { Math.sqrt(i); } end = new Date(); console.log("Operation took " + (end.getTime() - start.getTime()) + " msec");