Help us understand the problem. What is going on with this article?

経過時間をconsoleで手軽に計測するJavaScript

More than 5 years have passed since last update.
console.time('a');  // 識別子を与えないと動かない
// 処理…
console.timeEnd('a');

console.time.png

Chrome, Safari, Firefoxに加え、IEも11から利用可能。

コンソールじゃないところに時間を出力するなら、

自前で計測する。

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