JS快速排序记录

var arr = [1,5,25,7,55,21,45,2,3,64,135,333,7882]

function quickSort(arr){
    if(arr.length < 2) return arr; //如果长度小于2 直接返回
   let left = 0, right = arr.length - 1;
   while(left < right) {
      while(arr[right] > a[0] && left < right){ // 找出右边比a[0]小的
          right = right - 1
     }
     while(arr[left] <= a[0] && left < right){ // 找出右边比a[0]大的
        left++;
     }
     if(left == right){
        let mid = arr[right];
       arr[right] = arr[0];
       arr[0] = mid;
       break;
     }
     let tmp = arr[right]
     arr[right] = arr[left]
     arr[left] = tmp
   }
   return quickSort(arr.slice(0,left)).concat(arr.slice(left,right+1)).concat(quickSort(arr.slice(right+1)))
}
console.log(quickSort(arr))