1.两数之和

https://leetcode-cn.com/problems/two-sum/

/**
 * @param {number[]} nums
 * @param {number} target
 * @return {number[]}
 */
var twoSum = function (nums, target) {
    var result = new Array();
    var temp = new Array();
    for (let i = 0; i < nums.length; i++) {
        var value = nums[i];
        var search = temp[target - value];
        if (search != undefined) {
            result.push(search);
            result.push(i);
            return result;
        } else {
            temp[value] = i;
        }
    }
    return null;
};