js實(shí)現(xiàn)貪吃蛇游戲（簡(jiǎn)易版）
本文實(shí)例為大家分享了js實(shí)現(xiàn)貪吃蛇游戲的具體代碼，供大家參考，具體內(nèi)容如下
直接開(kāi)始
效果圖:
項(xiàng)目結(jié)構(gòu):圖片自己找的
1.html
<!DOCTYPE html><html> <head> <meta charset='utf-8' /> <title></title> <style type='text/css'> * { padding: 0; margin: 0; } </style> </head> <body> <canvas id=’view’ style='border:1px solid red;'></canvas> <button id=’start’>開(kāi)始</button> <button id=’parse’>暫停</button> <button id=’restart’>重新開(kāi)始</button> <h4>最高分: <span id=’scoreMax’ style=’color:red;’>0</span></h4> <h4>分?jǐn)?shù): <span id=’score’ style=’color:skyblue;’>0</span></h4> <script src='http://m.b3g6.com/bcjs/js/config.js' type='text/javascript' charset='utf-8'></script> <script src='http://m.b3g6.com/bcjs/js/score.js' type='text/javascript' charset='utf-8'></script> <script src='http://m.b3g6.com/bcjs/js/area.js' type='text/javascript' charset='utf-8'></script> <script src='http://m.b3g6.com/bcjs/js/food.js' type='text/javascript' charset='utf-8'></script> <script src='http://m.b3g6.com/bcjs/js/snake.js' type='text/javascript' charset='utf-8'></script> <script src='http://m.b3g6.com/bcjs/js/move.js' type='text/javascript' charset='utf-8'></script> <script src='http://m.b3g6.com/bcjs/js/init.js' type='text/javascript' charset='utf-8'></script> <script type='text/javascript'> var start = document.getElementById(’start’); var parse = document.getElementById(’parse’); var restart = document.getElementById(’restart’); start.onclick = function() { parse = false; } parse.onclick = function() { parse = true; } restart.onclick = function() { snake && snake.restart(); parse = false; } </script> </body></html>
2.area.js
function render(x, y, color, img) { ctx.beginPath(); ctx.fillStyle = color || ’red’; if (img) { ctx.drawImage(img, x * w, y * h, img.width, img.height); } else { ctx.fillRect(x * w, y * h, w, h); } ctx.closePath(); ctx.fill();}function clear(x, y) { ctx.clearRect(x * w, y * h, w, h);}
3.config.js
var exit = [];var parse = true;var view = document.getElementById(’view’);var ctx = view.getContext(’2d’);var width = 400, height = 400;var w = 20, h = 20;var maxX = (width / w) - 1, maxY = (height / h) - 1;var speed = 500;var scoreMax = 0;var imgsrcs = [ ’./img/snakeheadup.png’, //圖片自己找 ’./img/snakeheaddown.png’, ’./img/snakeheadleft.png’, ’./img/snakeheadright.png’];var imgs = [];var length = 4;for (var i = 0, len = imgsrcs.length; i < len; i++) { var img = new Image(20,20); img.src = imgsrcs[i]; imgs[i] = img;}var food, snake, move, score;
4.food.js
function Food() { this.init();}Food.prototype = { init: function() { this.update(); }, update: function() { var food = this.makeCoordinate(); this.food = food; var foodX = food[0]; var foodY = food[1]; this.render(foodX, foodY); }, render: function(x, y) { render(x, y, ’blue’); }, makeCoordinate: function() { var x = this.random(0, maxX); var y = this.random(0, maxY); for (var i = 0; i < exit.length; i++) { if (exit[i].toString() == [x, y].toString()) { return this.makeCoordinate(); } } return [x, y]; }, random: function(min, max) { return Math.floor(Math.random() * (max - min + 1)) + min; }}
5.init.js
function init() { food = new Food(); snake = new Snake(); move = new Move(); score = new Score(); var timer = setInterval(function() { if (!parse) { snake.move(); } }, speed);}for (var j = 0; j < imgs.length; j++) { imgs[j].onload = function() { length--; if (length == 0) { init(); } }}
6.move.js
function Move() {}Move.prototype = { up: function(s) { snake.move(’up’); }, down: function(s) { snake.move(’down’); }, left: function(s) { snake.move(’left’); }, right: function(s) { snake.move(’right’); }}document.onkeydown = function(e) { var key = e.keyCode; if(!parse){ switch (key) { case 37: case 65: move.left(snake); break; case 38: case 87: move.up(snake); break; case 39: case 68: move.right(snake); break; case 40: case 83: move.down(snake); break; default: break; } }};
7.score.js
var scoreDom = document.getElementById(’score’);var scoreMaxDom = document.getElementById(’scoreMax’);function Score() { this.score = 0;}Score.prototype = { scoreAdd: function() { this.score += 1; scoreDom.innerHTML = this.score; }, scoreClear: function() { this.score = 0; scoreDom.innerHTML = 0; }, highScore: function() { scoreMax = scoreMax > this.score ? scoreMax : this.score; scoreMaxDom.innerHTML = scoreMax; }}
8.snake.js
function Snake() { this.head = [0, 5, imgs[1]]; // x,y坐標(biāo),頭 this.body = []; // 二維數(shù)組，身體 this.snake = []; //完整的蛇 this.init(6); this.direction = ’down’; // 默認(rèn)向下運(yùn)動(dòng)}Snake.prototype = { init: function(len) { len = len ? len > 10 ? 10 : len : 5; var head = this.head = [0, len, imgs[1]]; var body = this.body; for (var i = 0; i < len; i++) { body.push([0, i]); } this.getSnake(); }, restart: function() { ctx.clearRect(0, 0, width, height); this.head = [0, 5, imgs[1]]; // x,y坐標(biāo),頭 this.body = []; // 二維數(shù)組，身體 this.snake = []; //完整的蛇 exit = []; this.direction = ’down’; // 默認(rèn)向下運(yùn)動(dòng) this.init(6); food.update(); score.scoreClear(); }, eat: function() { var head = [this.head[0], this.head[1]]; var body = this.body; if (food.food.toString() == head.toString()) { food.update(); score.scoreAdd(); return true; } return false; }, update: function(direction) { var oldDirection = this.direction; this.direction = direction || this.direction; if ((this.direction == ’down’ && oldDirection == ’up’) || (this.direction == ’up’ && oldDirection == ’down’) || (this.direction == ’left’ && oldDirection == ’right’) || (this.direction == ’right’ && oldDirection == ’left’)) { this.direction = oldDirection; } if (this.direction == ’left’ && oldDirection != ’right’) { this.head[0] -= 1; this.head[2] = imgs[2]; } else if (this.direction == ’right’ && oldDirection != ’left’) { this.head[0] += 1; this.head[2] = imgs[3]; } else if (this.direction == ’up’ && oldDirection != ’down’) { this.head[1] -= 1; this.head[2] = imgs[0]; } else if (this.direction == ’down’ && oldDirection != ’up’) { this.head[1] += 1; this.head[2] = imgs[1]; } this.die(); }, gameOver: function() { alert(’game over!’) console.log(’game over!’); parse = true; score.highScore(); }, die: function() { var head = this.head; var x = head[0], y = head[1]; if (x < 0 || x > maxX || y < 0 || y > maxY) { this.gameOver(); } var body = this.body; for (var i = 0; i < body.length; i++) { if (body[i].toString() == [x, y].toString()) { this.gameOver(); } } }, render: function() { var snake = this.snake; for (var i = 0, len = snake.length; i < len; i++) { var item = snake[i]; render(item[0], item[1], ’green’, item[2]); } }, move: function(direction) { var head = this.head; var headCopy = head.slice(); //之前的頭 var body = this.body; body.push([headCopy[0], headCopy[1]]); this.update(direction); var eat = this.eat(); if (!eat) { var del = body.shift(); clear(del[0], del[1]); } this.getSnake(); }, getSnake: function() { var head = this.head; var body = this.body; var snake = this.snake = []; for (var i = 0, l = body.length; i < l; i++) { snake.push(body[i]); } snake.push(head); exit = []; for (var i = 0; i < snake.length; i++) { exit.push(snake[i]); } this.render(); }}
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