LeetCode-1. Two Sum

Given nums = [2, 7, 11, 15], target = 9,

Because nums[0] + nums[1] = 2 + 7 = 9,
return [0, 1].

/**
 * @param {number[]} nums
 * @param {number} target
 * @return {number[]}
 */
var twoSum = function(nums, target) {
    for(var i = 0; i < nums.length; i++){
        for(var j = i + 1; j < nums.length; j++){
            if(nums[i] + nums[j] == target){
                return [i,j];
            }
        }
    }
};