LeetCode 560. Subarray Sum Equals K javascript解决方案

/**
 * @param {number[]} nums
 * @param {number} k
 * @return {number}
 */
var subarraySum = function(nums, k) {
    let counter = 0;
    for(let i = 0; i < nums.length; ++i){
        let sum = 0;
        for(let j = i; j < nums.length; ++j){
            sum += nums[j];
            if(sum === k){
                ++counter;
            }
        }
    }
    return counter;
};