【Golang语言社区】H5游戏开发--JavaScript学习：21点游戏

李海彬

发布于 2018-03-27 11:32:24

1.7K0

发布于 2018-03-27 11:32:24

文章被收录于专栏：Golang语言社区

一、游戏规则

21点游戏的规则有很多种，我在写这个21点游戏的时候，选取了一种规则，描述如下：

1、游戏共有两名玩家，玩家1（庄家）和玩家2，在我编写的这个21点中，玩家1是电脑，玩家2是你，电脑坐庄。

2、一开始，给你和庄家各发两张牌，你可以看到你的两张牌，庄家的牌一张是明牌，一张是暗牌（暗牌是扣过来的牌，你不知道具体点数是多少）。

3、你和庄家的牌都是从一副牌里发出来的，共计52张（不要大小Joker）。

4、A可以当做1点和11点用，J、Q、K当做10点用，其他牌按面值计算点数。

5、发牌后，你可以选择要或不要牌，选择要牌后，如果你的点数大于21点，你就输了，否则你还可以选择要或不要牌，如果你选择不要牌，则轮到庄家要牌。

6、轮到庄家时，如果庄家的点数小于17点，则庄家必须要牌，当庄家点数大于或等于17时，庄家有权继续选择要或不要。如果庄家点数大于21点，则判定庄家输。

7、如果你和庄家都不要了，且双方都没有爆掉，则双方摊牌，计算双方点数，以点数大者胜，若双方点数一致则为平局。

二、目录结构

游戏的目录结构如下：

1、resource目录下，存储了游戏需要使用的图片。

2、bgm.ogg是游戏的背景音乐（我把QQ斗地主的背景音乐放进来了╮(╯▽╰)╭）

3、black_jack.html是一个网页，使用浏览器打开它就可以开始进行游戏了

4、black_jack.js存储了JavaScript代码

resource目录下的图片，包括纸牌图案、玩家头像等内容：

三、页面代码

black_jack.html页面代码如下：

<html>
    <head>
        <title>JS学习 - 21点 (black jack)</title>
    <meta http-equiv="Content-Type" content="text/html;charset=gb2312"/>
    </head>
    <style type="text/css">
        table th
        {            text-align: center;            text-decoration: none;            font-weight: normal;            padding: 3px 6px 3px 6px;            width:200px;
        }        table td
        {            vertical-align: center;            text-align: center;            padding: 3px 6px 3px 6px;            margin: 0px;
        }    </style> 
    <body>
    <table width="100%">
      <tr> 
        <td>
          <div align="left">
            21点游戏 (Black Jack)          </div>
        </td>
        <td>
          <div align="right">
            <audio width="300" height="10" controls autoplay="true" loop="true">
  　　        <source src="bgm.ogg" type="video/ogg"/>
  　　      </audio>
          </div> 
        </td>
      </tr>
    </table>
      <hr>
        <table id="tableboard">
      <tr>
        <td id="player1"><img src="resource\computer.png" /></td>
        <td/><td/><td/><td/><td/><td/><td/><td/><td/><td/><td/><td/><td/>
      </tr>
      <tr>
        <td id="player2"><img src="resource\player.jpg" /></td>
        <td/><td/><td/><td/><td/><td/><td/><td/><td/><td/><td/><td/><td/>
      </tr>
    </table>
    <hr>
    <table>
      <tr> 
        <td>
          <div id="score"></div>
        </td>
        <td>
          <div id="bulletin">请做出选择 (Please make a choice.)</div>
        </td>
      </tr>
    </table>
    <hr>
    <input type="button" id="hit" value="加一张牌 (HIT)" onclick="hit();" />
    <input type="button" id="stand" value="我不要了 (STAND)" onclick="stand();" />
    <!--<input type="button" id="restart" value="再玩一局 (FIGHT AGAIN)" onclick="location.reload();" />-->
    <input type="button" id="restart" value="再玩一局 (FIGHT AGAIN)" onclick="restart();" />
    <script src="black_jack.js"></script>
    </body></html>

black_jack.js页面代码如下：

//Firefox44.0，如果再来一局功能用location.reload()实现，则必须带上这两句话//document.getElementById("hit").disabled = false;//document.getElementById("stand").disabled = false;
var counter = 0; //发牌次数var winner = ""; //胜利者 player1 - 电脑/player2 - 玩家var hasStood = false; //标记玩家是否已经不要牌
//所有的牌var cards = ["club01", "club02", "club03", "club04", "club05", "club06", "club07", "club08", "club09", "club10", "club11", "club12", "club13", "diamond01", "diamond02", "diamond03", "diamond04", "diamond05", "diamond06", "diamond07","diamond08", "diamond09", "diamond10", "diamond11", "diamond12", "diamond13", "heart01", "heart02", "heart03", "heart04", "heart05", "heart06", "heart07", "heart08", "heart09", "heart10", "heart11", "heart12", "heart13", "spade01", "spade02", "spade03", "spade04", "spade05", "spade06", "spade07", "spade08", "spade09", "spade10", "spade11", "spade12", "spade13"];
//生成随机数var getRand = function (begin, end) {    return Math.floor(Math.random() * (end - begin)) + begin;}
//洗牌var rand, tmp;for (var i = 0; i < 1000; i++) {    rand = getRand(1, 52);    tmp = cards[0];    cards[0] = cards[rand];    cards[rand] = tmp;}
//玩家手牌var cards1 = [getNewCard(), getNewCard()];var cards2 = [getNewCard(), getNewCard()];
var table = document.getElementById("tableboard");table.rows[0].cells[1].innerHTML = "<img src=\"resource\\cardback.png\" />";table.rows[0].cells[2].innerHTML = "<img src=\"resource\\" + cards1[1] + ".jpg\" />";table.rows[1].cells[1].innerHTML = "<img src=\"resource\\" + cards2[0] + ".jpg\" />";table.rows[1].cells[2].innerHTML = "<img src=\"resource\\" + cards2[1] + ".jpg\" />";showScore();
//玩家再要一张牌function hit() {    getNewCard("player2");    if(checkIfBust("player2")) {        document.getElementById("bulletin").innerHTML = "你爆了 (You BUST!)";        document.getElementById("hit").disabled = true;        document.getElementById("stand").disabled = true;        winner = "player1";    }    showScore();}
//玩家选择不要了function stand() {    hasStood = true;    document.getElementById("hit").disabled = true;    document.getElementById("stand").disabled = true;    table.rows[0].cells[1].innerHTML = "<img src=\"resource\\" + cards1[0] + ".jpg\" />";    //电脑开始要牌    while (calcResult("player1") < 17) {        getNewCard("player1");        if(checkIfBust("player1")) {            document.getElementById("bulletin").innerHTML = "电脑爆了 (Computer BUST!)";            document.getElementById("hit").disabled = true;            document.getElementById("stand").disabled = true;            winner = "player2";        }    }    //如两名玩家都未爆掉，则以分数高者为胜    if (winner == "") {        var result1 = calcResult("player1");        var result2 = calcResult("player2");        if (result1 == result2) {            document.getElementById("bulletin").innerHTML = "平局 (PUSH!)";        } else if (result1 > result2) {            document.getElementById("bulletin").innerHTML = "你输了 (You LOSE)";        } else if (result1 < result2) {            document.getElementById("bulletin").innerHTML = "你赢了 (You WIN!)";        }    }    showScore();}
//获取一张新牌function getNewCard(player) {    var card = cards[counter++];    if (player == "player1") {        var len = cards1.length;        cards1[len] = card;        table.rows[0].cells[len + 1].innerHTML =             "<img src=\"resource\\" + cards1[len] + ".jpg\" />";    } else if (player == "player2") {        var len = cards2.length;        cards2[len] = card;        table.rows[1].cells[len + 1].innerHTML =             "<img src=\"resource\\" + cards2[len] + ".jpg\" />";    }    return card;}
//判断当前情况是否爆掉function checkIfBust(player) {    var result = 0;    if (player == "player1") {        for (var i = 0; i < cards1.length; i++) {            //parseInt一定要指定10进制，否则IE8下报错            var c = parseInt(cards1[i].substr(cards1[i].length - 2), "10");            if (c > 10) {                c = 10;            }            result += c;        }        if (result > 21) {            return true;        } else {            return false;        }    } else if (player == "player2") {        for (var i = 0; i < cards2.length; i++) {            var c = parseInt(cards2[i].substr(cards2[i].length - 2), "10");            if (c > 10) {                c = 10;            }            result += c;        }        if (result > 21) {            return true;        } else {            return false;        }    }}
//计算一名玩家的得分分数function calcResult(player) {    var result = 0;    var countOfA = 0;    if (player == "player1") {        for (var i = 0; i < cards1.length; i++) {            var c = parseInt(cards1[i].substr(cards1[i].length - 2), "10");            if (c > 10) {                c = 10;            } else if (c == 1) {                countOfA++;            }            result += c;        }        for (var i = 0; i < countOfA; i++) {            if (result + 10 <= 21) {                result += 10;            } else {                break;            }        }    } else {        for (var i = 0; i < cards2.length; i++) {            var c = parseInt(cards2[i].substr(cards2[i].length - 2), "10");            if (c > 10) {                c = 10;            } else if (c == 1) {                countOfA++;            }            result += c;        }        for (var i = 0; i < countOfA; i++) {            if (result + 10 <= 21) {                result += 10;            } else {                break;            }        }    }    return result;}
function showScore() {    var result1 = calcResult("player1");    var result2 = calcResult("player2");    document.getElementById("score").innerHTML =         "[Computer : You = " + (hasStood == true ? result1 : "?") + " : " + result2 + "]";}
function restart() {    document.getElementById("hit").disabled = false;    document.getElementById("stand").disabled = false;    counter = 0; //发牌次数    winner = ""; //胜利者 player1 - 电脑/player2 - 玩家    hasStood = false; //标记玩家是否已经不要牌    cards = [    "club01", "club02", "club03", "club04", "club05", "club06", "club07",     "club08", "club09", "club10", "club11", "club12", "club13", "diamond01",     "diamond02", "diamond03", "diamond04", "diamond05", "diamond06", "diamond07",    "diamond08", "diamond09", "diamond10", "diamond11", "diamond12", "diamond13",     "heart01", "heart02", "heart03", "heart04", "heart05", "heart06", "heart07",     "heart08", "heart09", "heart10", "heart11", "heart12", "heart13",     "spade01", "spade02", "spade03", "spade04", "spade05", "spade06", "spade07",     "spade08", "spade09", "spade10", "spade11", "spade12", "spade13"];    //洗牌    for (var i = 0; i < 1000; i++) {        rand = getRand(1, 52);        tmp = cards[0];        cards[0] = cards[rand];        cards[rand] = tmp;    }    //玩家手牌    cards1 = [getNewCard(), getNewCard()];    cards2 = [getNewCard(), getNewCard()];    table.rows[0].cells[1].innerHTML = "<img src=\"resource\\cardback.png\" />";    table.rows[0].cells[2].innerHTML = "<img src=\"resource\\" + cards1[1] + ".jpg\" />";    table.rows[1].cells[1].innerHTML = "<img src=\"resource\\" + cards2[0] + ".jpg\" />";    table.rows[1].cells[2].innerHTML = "<img src=\"resource\\" + cards2[1] + ".jpg\" />";    //清空牌桌    for (var i = 3; i < table.rows[0].cells.length; i++) {        table.rows[0].cells[i].innerHTML = "";        table.rows[1].cells[i].innerHTML = "";    }    showScore();    document.getElementById("bulletin").innerHTML = "请做出选择 (Please make a choice.)";}
/*

四、效果演示

使用Firefox浏览器（版本号44.0）打开black_jack.html后，效果如下图所示：

游戏代码可以从这个链接下载到：http://pan.baidu.com/s/1c1v2MQk

五、几点感受

1、我在IE8（版本8.0.7601.17514）、Chrome（版本46.0.2490.80 m）、Firefox（44.0）三个浏览器上测试了效果，除IE8中无法播放音乐外，其他功能都是正常的。

2、浏览器兼容性问题确实是个令人头疼的问题，就以parseInt函数来说，传入参数为"08"时，IE8返回0，Chrome和Firefox返回8。后来查了下才知道，原来IE8把字符串第一个字符为0的数字自动解析为八进制数了，需要在parseInt的第二个参数中强制指定使用十进制规则转换，才能让三个浏览器返回同样的结果。

3、说句题外话，这个游戏里，电脑赢的概率比你大，毕竟赌博游戏永远是庄家占便宜╭(╯^╰)╮。

END

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原始发表：2017-06-07，如有侵权请联系 cloudcommunity@tencent.com 删除

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