Formats a number using fixed-point notation, if it has decimals.
- Use
Number.prototype.toFixed()
to convert the number to a fixed-point notation string. - Use
Number.parseFloat()
to convert the fixed-point notation string to a number, removing trailing zeros. - Use a template literal to convert the number to a string.
代码实现
const toOptionalFixed = (num, digits) =>
`${Number.parseFloat(num.toFixed(digits))}`;
toOptionalFixed(1, 2); // '1'
toOptionalFixed(1.001, 2); // '1'
toOptionalFixed(1.500, 2); // '1.5'
翻译自:https://www.30secondsofcode.org/js/s/number-to-optional-fixed