题解 | #无重复数组#

      const _getUniqueNums = (start, end, n) => {
      let arr=[];
      for (let i = 0; i < n; i++) {
             let a = Math.floor(Math.random() * (end - start + 1) + start);
              arr.push(a)
          }
              if(Array.from(new Set(arr)).length < arr.length){
                _getUniqueNums(start, end, n)
              }else{
                return arr
              }
            }