数组中有五个数字，求最大相连元素的个数

const arr1 = [5, 2, 3, 4, 10]
const arr2 = [3, 2, 6, 8, 7]
const arr3 = [2, 3, 4, 5, 1]
const arr4 = [25, 20, 1, 11, 9]
const arr5 = [24, 12, 4, 13, 11]
const arr6 = [24, 12, 4, 13, 11, 23, 5, 18, 19, 20, 39, 22, 37, 40, 36, 38]

function fn(arr) {
  // [24, 13, 12, 11, 4]
  arr.sort(function (a, b) {
    return b - a
  })

  const length = arr.length

  const list = []

  for (let i = 0; i < length; i++) {
    list.push(1)
  }

  // console.log(list)

  let index = 0

  for (let i = 1; i < length; i++) {
    const x = arr[i - 1]
    const y = arr[i]
    const z = x - y
    if (z !== 1) {
      if (list[index] > 1) {
        list[++index] = -z
        index++
      } else if (z === 1) {
        list[index] = -z
        index++
      }
    }

    if (z === 1) {
      list[index] += z
    }
  }

  // console.log(list)

  const filteredList = list.filter(function (value, index, array) {
    return value > 1
  })

  // console.log(filteredList)

  let total = 0

  if (filteredList.toString() !== '') {
    total = Math.max.apply(null, filteredList)
  }

  console.log(`相连元素个数为 ${total}`)
}

fn(arr1)
fn(arr2)
fn(arr3)
fn(arr4)
fn(arr5)
fn(arr6)

https://codepen.io/MonguDykrai/pen/xQzyGw