script.js

let boxes = document.querySelectorAll(".box");
let resetBtn = document.querySelector("#reset-btn");
let newGameBtn = document.querySelector("#new-btn");
let msgContainer = document.querySelector(".msg-container");
let msg = document.querySelector("#msg");

let turnO = true;
const winPatterns = [
    [0, 1, 2],
    [0, 3, 6],
    [0, 4, 8],
    [1, 4, 7],
    [2, 5, 8],
    [2, 4, 6],
    [3, 4, 5],
    [6, 7, 8],
];

boxes.forEach((box) => {
    box.addEventListener("click", () => {
       if (turnO) {
            //playerO
            box.innerText = "O";
           box.style.color = "green";
            turnO = false;
        } else {
            //playerX
            box.innerText = "X";
           box.style.color = "red";
            turnO = true;
        }
        checkWinner();
    });
});
const disableBoxes = () => {
    for(let box of boxes){
        box.disabled = true;
    }
};
const enableBoxes = () => {
    for (let box of boxes) {
        box.disabled = false;
        box.innerText="";
    }
};
const checkWinner = () => {
    for (let pattern of winPatterns) {
        let pos1Val = boxes[pattern[0]].innerText;
        let pos2Val = boxes[pattern[1]].innerText;
        let pos3Val = boxes[pattern[2]].innerText;

        if (pos1Val != "" && pos2Val != "" && pos3Val != "") {
            if (pos1Val === pos2Val && pos2Val === pos3Val) {
                showWinner(pos1Val);
                return true;
            }
        }
    }
};
const showWinner = (winner) => {
    msg.innerText = `Congratulations, Winner is ${winner}`;
    msgContainer.classList.remove("hide");
    disableBoxes();
};
const resetGame = () => {
    turn0 = true;
    enableBoxes();
    msgContainer.classList.add("hide");
};
newGameBtn.addEventListener("click", resetGame);
resetBtn.addEventListener("click", resetGame);