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.

代码片段

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

使用样例

round(1.005, 2); // 1.01