创建随时数组

createRandomList.js

function createRandom(start, end) {
  const range = end - start
  return start + Math.round(range * Math.random())
}

function createList(max=100) {
  const getInt = ()=> createRandom(1, max)
  const result = []
  let count = 0
  while(count < max) {
    const num = getInt()
    let index = num === 0 ? 0 : num -1
    if(result[index] === undefined) {
      result[index] = num
      count++
    }
  }
  return result
}