数字 Number

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

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
  }
}