30秒学会 JavaScript 片段 – Pad number

Pads a given number to the specified length.

• Use String.prototype.padStart() to pad the number to specified length, after converting it to a string.

代码实现

const padNumber = (n, l) => `${n}`.padStart(l, '0');

padNumber(1234, 6); // '001234'

翻译自：https://www.30secondsofcode.org/js/s/pad-number