js大數字轉換，將大額數字轉換爲萬、千萬、億等

代碼

/**
 * 大數字轉換，將大額數字轉換爲萬、千萬、億等
 * @param value 數字值
 */
export function bigNumberTransform (value) {
  const newValue = ['', '', '']
  let fr = 1000
  let num = 3
  let text1 = ''
  let fm = 1
  while (value / fr >= 1) {
    fr *= 10
    num += 1
    // console.log('數字', value / fr, 'num:', num)
  }
  if (num <= 4) { // 千
    newValue[0] = parseInt(value / 1000) + ''
    newValue[1] = '千'
  } else if (num <= 8) { // 萬
    text1 = parseInt(num - 4) / 3 > 1 ? '千萬' : '萬'
    // tslint:disable-next-line:no-shadowed-variable
    fm = text1 === '萬' ? 10000 : 10000000
    if (value % fm === 0) {
      newValue[0] = parseInt(value / fm) + ''
    } else {
      newValue[0] = parseFloat(value / fm).toFixed(2) + ''
    }
    newValue[1] = text1
  } else if (num <= 16) { // 億
    text1 = (num - 8) / 3 > 1 ? '千億' : '億'
    text1 = (num - 8) / 4 > 1 ? '萬億' : text1
    text1 = (num - 8) / 7 > 1 ? '千萬億' : text1
    // tslint:disable-next-line:no-shadowed-variable
    fm = 1
    if (text1 === '億') {
      fm = 100000000
    } else if (text1 === '千億') {
      fm = 100000000000
    } else if (text1 === '萬億') {
      fm = 1000000000000
    } else if (text1 === '千萬億') {
      fm = 1000000000000000
    }
    if (value % fm === 0) {
      newValue[0] = parseInt(value / fm) + ''
    } else {
      newValue[0] = parseFloat(value / fm).toFixed(2) + ''
    }
    newValue[1] = text1
  }
  if (value < 1000) {
    newValue[0] = value + ''
    newValue[1] = ''
  }
  return newValue.join('')
}