题解 | #无重复数组#

const _getUniqueNums = (start, end, n) => {
      // 补全代码
      let flag = true
      let res = []
      while (flag) {
        let temp = Math.floor(Math.random() * (end + 1 - start)) + start
        if (res.indexOf(temp) === -1) {
          res.push(temp)
          flag = res.length === n ? false : true
        }
      }
      return res
    }