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原生js編寫貪吃蛇小游戲

 更新時(shí)間：2021年05月12日 09:07:55   作者：你想變強(qiáng)嘛  
這篇文章主要為大家詳細(xì)介紹了原生js編寫貪吃蛇小游戲，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

本文實(shí)例為大家分享了js編寫貪吃蛇小游戲的具體代碼，供大家參考，具體內(nèi)容如下

剛學(xué)完js模仿著教程，把自己寫的js原生小程序。

HTML部分

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="./css/index.css" >
</head>
<body>
    <div class="content">
     <!-- 游戲開啟按鈕 -->
        <div class="btn startBtn"><button></button></div>
        <!-- 蛇身 -->
        <div id="snakeWrap"></div>
    </div>
    <!-- 引入外部js文件 -->
    <script src="./js/index.js"></script>
</body>
</html>

css部分

/* 整體樣式 */
.content{
    width: 640px;
    height: 640px;
    margin: 100px auto;
    position: relative;
}
 .btn{
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    background-color: rgba(0, 0, 0, 0.3);
    z-index: 2;
}

.btn button{
    background: none;
    border: none;
    background-size: 100% 100%;

    cursor: pointer;
    outline: none;

    position: absolute;
    left: 50%;
    top: 50%;
}

.startBtn button{
    width: 200px;
    height: 80px;
    background: url(../images/Snipaste_2021-05-08_08-52-45.png) no-repeat;
    background-size: contain;
    margin-left: -100px;
    margin-top: 222px;
}

#snakeWrap{
    width: 600px;
    height: 600px;
    background: #73aad4;
    border: 20px solid #13649c;
    position: relative;
}

.snakeHead{
    background-color: yellowgreen;
    border-radius: 50%;
}

.snakeBody{
    background-color: black;
    border-radius: 50%;
}

.food{
    background-color: red;
    border-radius: 50%;
}

js部分

var sw = 20,        //一個(gè)方塊的寬
    sh = 20,        //一個(gè)方塊的寬
    tr = 30,        //行數(shù)
    td = 30;        //列數(shù)

var snake = null,  //生成蛇的實(shí)例
    food = null;    //生成食物的實(shí)例
    game = null;   //創(chuàng)建游戲?qū)嵗?
    
//把整體看成是一個(gè)一個(gè)小方塊 移動(dòng)的的時(shí)候創(chuàng)建和刪除方塊(后續(xù)所有方塊的生成都會(huì)調(diào)用)
// 方塊構(gòu)造函數(shù)
function Square(x,y,classname){    //對(duì)應(yīng)css中三種蛇的樣式（蛇頭 蛇身 蛇尾）
    this.x = x * sw;
    this.y = y * sh;
    this.class = classname;
    this.viewContent = document.createElement('div');
    this.viewContent.className = this.class;             //將創(chuàng)建出來的div添加對(duì)應(yīng)css樣式
    this.parent = document.getElementById('snakeWrap');    
}

//在方塊構(gòu)造函數(shù)的 原型鏈 上創(chuàng)建create方法 確定新div的具體信息
//this指向Square
Square.prototype.create = function(){
    this.viewContent.style.position = 'absolute';
    this.viewContent.style.width = sw + 'px';
    this.viewContent.style.height = sh + 'px';
    this.viewContent.style.left = this.x + 'px';
    this.viewContent.style.top = this.y + 'px';

    this.parent.appendChild(this.viewContent);     //把新創(chuàng)建的div添加到頁(yè)面
}

//在方塊構(gòu)造函數(shù)的 原型鏈 上創(chuàng)建remove方法  用于移動(dòng)時(shí)刪除方塊
Square.prototype.remove = function(){
    this.parent.removeChild(this.viewContent);
}

// 蛇
function Snake(){
    this.head = null;       //存儲(chǔ)蛇頭信息
    this.tail = null;       //存儲(chǔ)蛇尾信息
    this.pos = [];          //存儲(chǔ)蛇身上的每一個(gè)方塊的位置

    this.directionNum = {   //存儲(chǔ)蛇走的方向
        left : {
            x : -1,
            y : 0
        },
        right : {
            x : 1,
            y : 0
        },
        up : {
            x : 0,
            y : -1
        },
        down : {
            x : 0,
            y : 1
        }
    }
}

//this 指向 Snake
Snake.prototype.init = function(){      //初始化
    // 創(chuàng)建蛇頭
    var snakeHead = new Square(2,0,'snakeHead');
    snakeHead.create();
    this.head = snakeHead;
    this.pos.push([2,0]);       //儲(chǔ)存蛇頭信息

    // 創(chuàng)建蛇身1
    var snakeBody1 = new Square(1,0,'snakeBody');
    snakeBody1.create();
    this.pos.push([1,0]);       //儲(chǔ)存蛇身信息

    // 創(chuàng)建蛇尾
    var snakeBody2 = new Square(0,0,'snakeBody');
    snakeBody2.create();
    this.tail = snakeBody2;
    this.pos.push([0,0]);       /儲(chǔ)存蛇尾信心

    //形成鏈表關(guān)系
    //蛇頭 蛇身 蛇尾的前后關(guān)系
    snakeHead.last = null;
    snakeHead.next = snakeBody1;

    snakeBody1.last = snakeHead;
    snakeBody1.next = snakeBody2;

    snakeBody2.last = snakeBody1;
    snakeBody2.next = null;

    //給蛇 添加一個(gè)默認(rèn)方向 向右
    this.direction = this.directionNum.right;
}

// 獲取蛇頭的下一個(gè)位置對(duì)應(yīng)的元素（this指向Snake）
// 獲取下一個(gè)點(diǎn)的坐標(biāo)并儲(chǔ)存到nextPos數(shù)組
Snake.prototype.getNextPos = function(){
    var nextPos = [
        this.head.x/sw + this.direction.x,         //this.direction.x、y 下面會(huì)將方向與鍵盤事件綁定 來確定下一個(gè)點(diǎn)生成的位置
        this.head.y/sh + this.direction.y
    ]
    
    // 下個(gè)點(diǎn)是自己，撞到了自己  游戲結(jié)束
    var selfCollied = false;
    this.pos.forEach(function(value){            //forEach遍歷數(shù)組 兩數(shù)組比較看是否有重復(fù)坐標(biāo)
        if (value[0] == nextPos[0] && value[1] == nextPos[1]){
            selfCollied = true;
        }
    })
 
 //撞到了自己  游戲結(jié)束
    if(selfCollied){
        this.、
        .die.call(this);
        return;
    }

    // 下個(gè)點(diǎn)是圍墻  游戲結(jié)束
    
    if(nextPos[0] > 29 || nextPos[0] < 0 || nextPos[1] > 29 || nextPos[1] < 0){
        this.strategies.die.call(this);
        return;
    }

    // 下個(gè)點(diǎn)是食物  吃

    if(food && food.pos[0] == nextPos[0] && food.pos[1] == nextPos[1]){
        this.strategies.eat.call(this);
        return;
    }

    // 下個(gè)點(diǎn)什么都不是  走

    this.strategies.move.call(this);
}


// 碰撞后要做的事

Snake.prototype.strategies = {
    move : function(format){ //參數(shù)用于判斷是否刪除蛇尾
        // 創(chuàng)建一個(gè)newbody,刪掉蛇頭
        var newBody = new Square(this.head.x/sw,this.head.y/sh,'snakeBody')
        newBody.next = this.head.next;
        newBody.next.last = newBody;
        newBody.last = null;
        this.head.remove();
        newBody.create();

        // 創(chuàng)建一個(gè)新蛇頭
        var newx = this.head.x/sw + this.direction.x;
        var newy = this.head.y/sh + this.direction.y;
        var newHead = new Square(newx,newy,'snakeHead')
        newHead.next = newBody;
        newBody.last = newHead;
        newHead.last = null;
        newHead.create();

        // 更新蛇身的坐標(biāo)
        this.pos.splice(0,0,[newx,newy]);
        this.head = newHead;

        //如果為false  則吃
        if(!format){
            this.tail.remove();
            this.tail = this.tail.last;

            this.pos.pop();
        }
    },
    eat : function(){
        this.strategies.move.call(this,true);
        game.score ++;
        createFood();
    },
    die : function(){
        game.over();
    }
}


snake = new Snake();


// 創(chuàng)建食物
function createFood(){
    // 食物小方塊坐標(biāo)
    var x = null;
    var y = null;

    var include = true;
    while(include){
        x = Math.round(Math.random()*(td - 1));
        y = Math.round(Math.random()*(tr - 1));

        snake.pos.forEach(function(value){
            if(x != value[0] && y != value[1]){
                include = false;
            }
        });
    }
    // 生成食物
    food = new Square(x,y,'food');
    food.pos = [x,y];

    var foodDom = document.querySelector('.food');
    if(foodDom){
        foodDom.style.left = x * sw + 'px';
        foodDom.style.top = y * sh + 'px';
    }else{
        food.create();
    }
}



// 創(chuàng)建游戲邏輯
function Game(){
    this.timer = null;
    this.score = 0;
}

Game.prototype.init = function(){
    snake.init();
    createFood();
 //這里曾經(jīng)的e.keycode e.which 都已禁用  使用e.key
    window.addEventListener('keydown',function(e){
        if(e.key == 'ArrowLeft' && snake.direction != snake.directionNum.right){
            snake.direction = snake.directionNum.left;
        }else if(e.key == 'ArrowUp' && snake.direction != snake.directionNum.down){
            snake.direction = snake.directionNum.up;
        }else if(e.key == 'ArrowRight' && snake.direction != snake.directionNum.left){
            snake.direction = snake.directionNum.right;
        }else if(e.key == 'ArrowDown' && snake.direction != snake.directionNum.up){
            snake.direction = snake.directionNum.down;
        }
    });
    this.start();
}

Game.prototype.start = function(){
    this.timer = setInterval(function(){
        snake.getNextPos();
    },0.0000000000000001)
}

Game.prototype.over = function(){
    clearInterval(this.timer);
    alert('你的得分為' + this.score);


    // 游戲回到最初始狀態(tài)
    var snakeWrap = document.getElementById('snakeWrap');
    snakeWrap.innerHTML = '';

    snake = new Snake();
    game = new Game();

    var startBtnWrap = document.querySelector('.startBtn');
    startBtnWrap.style.display = 'block';
}

// 開啟游戲

game = new Game();
var startBtn = document.querySelector('.startBtn button');
startBtn.onclick = function(){
    startBtn.parentNode.style.display = 'none';
    game.init();
}

簡(jiǎn)單的一個(gè)小游戲，如有問題請(qǐng)大佬指正。

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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