LeetCode238 除自身以外的数组乘积 JavaScript解法

/**
 * @param {number[]} nums
 * @return {number[]}
 */
var productExceptSelf = function(nums) {
    let left = 1;
    let right = 1;
    const len = nums.length;
    let ret = [];
    for(let i = 0; i<len; i++){
        ret[i] = left;
        left *= nums[i]
    }
    for (let j = len - 1; j>= 0; j--){
        ret[j] *= right;
        right *= nums[j]
    }
    return ret;
};