30秒学会 JavaScript 片段 – Round number to given precision

Rounds a number to a specified amount of digits.

• Use Math.round() and template literals to round the number to the specified number of digits.
• Omit the second argument, decimals, to round to an integer.

代码实现

const round = (n, decimals = 0) =>
  Number(`${Math.round(`${n}e${decimals}`)}e-${decimals}`);

round(1.005, 2); // 1.01

翻译自：https://www.30secondsofcode.org/js/s/round-number-to-precision