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I am developing a blackjack game. So far, everything is working fine except this small detail. Basically, the start game button should only be visible before the game and after the game. I have no problem setting it to hidden, but when I finish a game it doesn't work.

function startGame() {
    startGameButton.style.visibility = "hidden";
    if (!player.playerName) {
        player.playerName = prompt("你叫什么名字？")
        player.chips = 100

        playerEl.textContent = "玩家：" + player.playerName;
    }

    if (cards.length < 2) {
        let bet = prompt('你想下注多少（籌碼：' + player.chips + '）')
        player.chips = player.chips - bet;
        chipsEl.textContent = "籌碼：" + player.chips;
    }

    let firstCard = randomCard();
    let secondCard = randomCard();
    cards = [firstCard, secondCard];
    let tableFirstCard = randomCard();
    let tableSecondCard = randomCard();
    tableCards = [tableFirstCard, tableSecondCard];
    let message = "";
    let hasBlackJack = false;
    let isAlive = true;

    sum = firstCard + secondCard;
    newCardButton.style.visibility = "visible";
    startGameButton.textContent = "新游戲";

    if (sum < 21) {
        message = "你想要抽一張新牌嗎？";
    } else if (sum === 21) {
        message = "你得到了21點(diǎn)！";
        newCardButton.style.visibility = "hidden";
        startGameButton.style.visibility = "visible";
        player.chips = player.chips + bet * 2
        hasBlackJack = true;
    } else {
        startGameButton.style.visibility = "visible";
        isAlive = false;
        message = "運(yùn)氣不好！你已經(jīng)離開(kāi)游戲了！";
    }

    messageEl.textContent = message;
    cardsEl.textContent = "牌：" + firstCard + " " + secondCard;
    tableCardsEl.textContent = "桌面牌：" + tableSecondCard + " " + tableSecondCard;
    sumEl.textContent = "總和：" + sum;
    console.log("21點(diǎn)：" + hasBlackJack);
    console.log("存活：" + isAlive);
}

I even tried swapping the order to see if it made any difference, but all that happens is:

if (sum < 21) {
        message = "你想要抽一張新牌嗎？";
    } else if (sum === 21) {
        message = "你得到了21點(diǎn)！";
        newCardButton.style.visibility = "hidden";
        startGameButton.style.visibility = "visible";
        player.chips = player.chips + bet * 2
        hasBlackJack = true;
    } else {
        startGameButton.style.visibility = "visible";
        isAlive = false;
        message = "運(yùn)氣不好！你已經(jīng)離開(kāi)游戲了！";
    }

Everything in the if statement is happening except the visibility part.

If you need more context, please refer to the code link: https://github.com/pedrosilva410/blackjack-game