判断数组中是否含有两个值相加

function add() {
    let nums = [2, 5, 5, 6, 1];
    let k = 10;
    let tempNum;
    for (key in nums) {
        tempNum = k - nums[key];
        if (nums.find((elem,index) => elem === tempNum&&key!==index)) {
            return true;
        }
    }
    return false;
}