# 数字 Number

# 数字千分位分割

function commafy(num) {
  return (num.toString().indexOf('.') !== -1) ? num.toLocaleString() : num.toString().replace(/(\d)(?=(?:\d{3})+$)/g, '$1,')
}

1
2

# 生成随机数

function randomNum(min, max) {
  switch (arguments.length) {
    case 1:
      return parseInt(Math.random() * min + 1, 10)
    case 2:
      return parseInt(Math.random() * (max - min + 1) + min, 10)
    default:
      return 0
  }
}

1
2
3
4
5
6
7
8
9

# 来源

https://qishaoxuan.github.io/js_tricks/number/ (opens new window)