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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))