原生js編寫貪吃蛇小遊戲
本文實例為大傢分享瞭js編寫貪吃蛇小遊戲的具體代碼，供大傢參考，具體內容如下
剛學完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">
<!-- 遊戲開啟按鈕 -->
<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, //一個方塊的寬
sh = 20, //一個方塊的寬
tr = 30, //行數
td = 30; //列數
var snake = null, //生成蛇的實例
food = null; //生成食物的實例
game = null; //創建遊戲實例
//把整體看成是一個一個小方塊 移動的的時候創建和刪除方塊(後續所有方塊的生成都會調用)
// 方塊構造函數
function Square(x,y,classname){ //對應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; //將創建出來的div添加對應css樣式
this.parent = document.getElementById('snakeWrap');
}
//在方塊構造函數的 原型鏈 上創建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); //把新創建的div添加到頁面
}
//在方塊構造函數的 原型鏈 上創建remove方法 用於移動時刪除方塊
Square.prototype.remove = function(){
this.parent.removeChild(this.viewContent);
}
// 蛇
function Snake(){
this.head = null; //存儲蛇頭信息
this.tail = null; //存儲蛇尾信息
this.pos = []; //存儲蛇身上的每一個方塊的位置
this.directionNum = { //存儲蛇走的方向
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
// 創建蛇頭
var snakeHead = new Square(2,0,'snakeHead');
snakeHead.create();
this.head = snakeHead;
this.pos.push([2,0]); //儲存蛇頭信息
// 創建蛇身1
var snakeBody1 = new Square(1,0,'snakeBody');
snakeBody1.create();
this.pos.push([1,0]); //儲存蛇身信息
// 創建蛇尾
var snakeBody2 = new Square(0,0,'snakeBody');
snakeBody2.create();
this.tail = snakeBody2;
this.pos.push([0,0]); /儲存蛇尾信心
//形成鏈表關系
//蛇頭 蛇身 蛇尾的前後關系
snakeHead.last = null;
snakeHead.next = snakeBody1;
snakeBody1.last = snakeHead;
snakeBody1.next = snakeBody2;
snakeBody2.last = snakeBody1;
snakeBody2.next = null;
//給蛇 添加一個默認方向 向右
this.direction = this.directionNum.right;
}
// 獲取蛇頭的下一個位置對應的元素（this指向Snake）
// 獲取下一個點的坐標並儲存到nextPos數組
Snake.prototype.getNextPos = function(){
var nextPos = [
this.head.x/sw + this.direction.x, //this.direction.x、y 下面會將方向與鍵盤事件綁定 來確定下一個點生成的位置
this.head.y/sh + this.direction.y
]
// 下個點是自己，撞到瞭自己 遊戲結束
var selfCollied = false;
this.pos.forEach(function(value){ //forEach遍歷數組 兩數組比較看是否有重復坐標
if (value[0] == nextPos[0] && value[1] == nextPos[1]){
selfCollied = true;
}
})
//撞到瞭自己 遊戲結束
if(selfCollied){
this.、
.die.call(this);
return;
}
// 下個點是圍墻 遊戲結束
if(nextPos[0] > 29 || nextPos[0] < 0 || nextPos[1] > 29 || nextPos[1] < 0){
this.strategies.die.call(this);
return;
}
// 下個點是食物 吃
if(food && food.pos[0] == nextPos[0] && food.pos[1] == nextPos[1]){
this.strategies.eat.call(this);
return;
}
// 下個點什麼都不是 走
this.strategies.move.call(this);
}
// 碰撞後要做的事
Snake.prototype.strategies = {
move : function(format){ //參數用於判斷是否刪除蛇尾
// 創建一個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();
// 創建一個新蛇頭
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
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();
// 創建食物
function createFood(){
// 食物小方塊坐標
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();
}
}
// 創建遊戲邏輯
function Game(){
this.timer = null;
this.score = 0;
}
Game.prototype.init = function(){
snake.init();
createFood();
//這裡曾經的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);
// 遊戲回到最初始狀態
var snakeWrap = document.getElementById('snakeWrap');
snakeWrap.innerHTML = '';
snake = new Snake();
game = new Game();
var startBtnWrap = document.querySelector('.startBtn');
startBtnWrap.style.display = 'block';
}
// 開啟遊戲
game = new Game();
var startBtn = document.querySelector('.startBtn button');
startBtn.onclick = function(){
startBtn.parentNode.style.display = 'none';
game.init();
}
簡單的一個小遊戲，如有問題請大佬指正。
以上就是本文的全部內容，希望對大傢的學習有所幫助，也希望大傢多多支持WalkonNet。