js处理分数相加

const list = ['1/3', '1/4', '1/5', '1/6'];
console.log(CalculateFraction(list));
function CalculateFraction (list) {
  if (list.length === 0) {
    return false
  }
  let denominator = 0 //分母
  let denominators = [] //分母集合
  let numerator = 0 // 分子
  let numerators = [] //分子集合
  list.forEach(item => {
    const [n, d] = item.split('/')
    numerators.push(n)
    denominators.push(d)
  })

  // 根据分母找出最小公倍数
  let pre = parseInt(denominators[0])
  let leastMultiple = pre
  for (let i = 1; i < denominators.length; i++) {
    const d = denominators[i]
    leastMultiple = d > pre ? d : pre
    while (leastMultiple <= pre * d) {
      if (leastMultiple % d === 0 && leastMultiple % pre === 0) {
        break
      }
      leastMultiple++
    }
    pre = leastMultiple
  }
  denominator = leastMultiple
  numerators.forEach((item, index) => {
    numerator += item * (denominator / denominators[index])
  })
  return numerator + '/' + denominator
}