SOURCE

var nums = [2, 7, 11, 15]
var target = 9
var twoSum = function (nums, target) {
    for (i = 0; i < nums.length; i++) {
        for (j = i + 1; j < nums.length; j++) {
            if (nums[i] + nums[j] == target) {
                console.log('['+i + ',' + j+']');
                return new Array(i,j);
            }
        }
    }

};
twoSum(nums, target);
console.log(twoSum(nums,target));