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这里还是有点新,所以请多多包涵,因为我是 JS 的新手,而且有点自学。

所以我一直在尝试编写一个简单的 Rock Paper Scissors 游戏,并且我已经让它在我的机器上本地运行,但我一生无法弄清楚为什么它不能在 JSFiddle 上运行。我首先开始在 JSFiddle 中编写它,但是在我对 JSLint 认为它有效但游戏挂在我的 JS 中的某个地方感到沮丧之后,我决定将它移到记事本并在本地尝试。好吧,它有效,但我不知道为什么它不喜欢小提琴。也许你们可以为我解释一下

<html>
<head>
<script>
var ties = 0;
var wins = 0;
var losses = 0;

// randInt returns a random integer between 0 and 2
function randInt() {return Math.floor(Math.random()*3);}

function msgAlert(msg, player, comp) {
    var outcome = ["Rock", "Paper", "Scissors"];

    if (msg === "tie") {
        alert("Tie!\n" + "Player: " + outcome[player] + "\n" + "Computer: " +     outcome[comp]);
    }

    if (msg === "win") {
        alert("You won!\n" + "Player: " + outcome[player] + "\n" + "Computer: " +     outcome[comp]);
    }          

    if (msg === "lose") {
        alert("You lost!\n" + "Player: " + outcome[player] + "\n" + "Computer: " +     outcome[comp]);
    }
}

function updateScore(result) {
    var tieElement = document.getElementById("tie");
    var winElement = document.getElementById("win");
    var loseElement = document.getElementById("lose");

    if (result === "tie") {
        ties++;
        tieElement.innerText = ties;
    }

    if (result === "win") {
        wins++;
        winElement.innerText = wins;
    }

    if (result === "lose") {
        losses++;
        loseElement.innerText = losses;
    }
}

function hand(player) {
    var comp = randInt();

    if (player === comp) {
        updateScore("tie");
        msgAlert("tie", player, comp);
    }

    /* Rock Conditions */
    if (player === 0 && comp === 1) {
        updateScore("lose");
        msgAlert("lose", player, comp);
    }

    if (player === 0 && comp === 2) {
        updateScore("win");
        msgAlert("win", player, comp);
    }

    /* Paper Conditions */
    if (player === 1 && comp === 0) {
        updateScore("win");
        msgAlert("win", player, comp);
    }

    if (player === 1 && comp === 2) {
        updateScore("lose");
        msgAlert("lose", player, comp);
    }

    /* Scissors Conditions */
    if (player === 2 && comp === 0) {
        updateScore("lose");
        msgAlert("lose", player, comp);
    }

    if (player === 2 && comp === 1) {
        updateScore("win");
        msgAlert("win", player, comp);
    }
}
</script>
</head>

<body bgcolor=tan>
    <H1 align=center>Let's play Rock Paper Scissors!</H1>
    <H2>Instructions</H2>
    <p>Click a button to choose what to throw</p>
    <p id="buttons">
        <input type="button" value="Rock" onclick="hand(0);" />
        <input type="button" value="Paper" onclick="hand(1);" />
        <input type="button" value="Scissors" onclick="hand(2);" /> 
    </p>
    <h3>Scoreboard:</h3>
    <ul id="scoreboard">
        <li>
            Wins: <span id="win">0</span>
        </li>
        <li>
            Losses: <span id="lose">0</span>
        </li>
        <li>
            Ties: <span id="tie">0</span>
        </li>
    </ul>
</body>
</html>

jsbin.com 上的示例代码

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2 回答 2

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要使其在 jsFiddle 中工作,您必须将 jsFiddle 中的左上角设置设置为“No Wrap - in <body>”。

当您将其设置为onload时,会将您的所有代码放入 onload 处理程序中,并且不会在全局范围内声明任何内容(它在 onload 处理程序函数中声明)。由于没有全局声明任何内容,因此该hand()函数不是全局的,并且在直接从您的 HTML 调用时将不起作用,因为它必须在范围内是全局的,才能通过从您的 HTML 直接调用来访问。

工作演示:http: //jsfiddle.net/jfriend00/E9aFy/

于 2013-10-31T02:07:22.700 回答
0

该代码在 jsbin.com 上完美运行,查看并启用 javascript(如果不启用)

于 2013-10-31T02:07:04.337 回答