question/add-comma-to-number

[giscus[bot]]

question/add-comma-to-number

北美前端面试攻略

https://us-fe.github.io/question/add-comma-to-number.html

[xiaoyu2er]

方法一 Number.toLocaleString()

/**
 * @param {number} num
 * @return {string}
 */
function addComma(num) {
  return num.toLocaleString('en-US');
}

但是我们此法有两个问题：

• 兼容性问题
• 会出现精度缺失

-.1234 spec  , expects "-0.1234" but gets "-0.123"

12345678.12345 spec  , expects "12,345,678.12345" but gets "12,345,678.123"