html5实现贪吃蛇小游戏

Html

Css

Js

#myCanvas { border:1px solid #f00; }

var canvas = document.getElementById("myCanvas"); var ctx = canvas.getContext("2d"); var w = 15; //格子宽、高 var snaLen = 6; //初始长度 var snake = []; //身体长度 for (var i = 0; i < snaLen; i++) { snake[i] = new cell(i, 0, 39); } var head = snake[snaLen - 1]; //头部 //初始食物 var foodx = Math.ceil(Math.random() * 28 + 1); var foody = Math.ceil(Math.random() * 28 + 1); var food = new Food(foodx, foody); //食物 function Food(x, y) { this.x = x; this.y = y; return this; } //身体 function cell(x, y, d) { this.x = x; this.y = y; this.d = d; return this; } //动作 function draw() { ctx.clearRect(0, 0, 450, 450); //画布局 // for(var i = 0; i < 30; i++){ // ctx.strokeStyle = "#ccc";//线条颜色 // ctx.beginPath(); // ctx.moveTo(0,i*w); // ctx.lineTo(450,i*w); // ctx.moveTo(i*w,0); // ctx.lineTo(i*w,450); // ctx.closePath(); // ctx.stroke(); // } //画蛇身 for (var j = 0; j < snake.length; j++) { ctx.fillStyle = "black"; if (j == snake.length - 1) { ctx.fillStyle = "red"; } ctx.beginPath(); ctx.rect(snake[j].x * w, snake[j].y * w, w, w); ctx.closePath(); ctx.fill(); ctx.stroke(); } //出现食物 drawFood(); //吃到食物 if (head.x == food.x && head.y == food.y) { initFood(); food = new Food(foodx, foody); //重新出现食物 drawFood(); //增加蛇的长度 有些小瑕疵，蛇身增长时应该是身体增长，而不是在蛇头上增长 var newCell = new cell(head.x, head.y, head.d); switch (head.d) { case 40: newCell.y++; break; //下 case 39: newCell.x++; break; //右 case 38: newCell.y--; break; //上 case 37: newCell.x--; break; //左 } snake[snake.length] = newCell; head = newCell; //head = } } //随机初始化食物 function initFood() { foodx = Math.ceil(Math.random() * 28 + 1); foody = Math.ceil(Math.random() * 28 + 1); for (var i = 0; i < snake.length; i++) { if (snake[i].x == foodx && snake[i].y == foody) { initFood(); } } } //画食物 function drawFood() { //绘制食物 ctx.fillStyle = "blue"; ctx.beginPath(); ctx.rect(food.x * w, food.y * w, w, w); ctx.closePath(); ctx.fill(); } draw(); //监听键盘事件 document.onkeydown = function(e) { //下40 ， 右边39，左边37，上38 键盘事件 var keyCode = e.keyCode; if (head.d - keyCode != 2 && head.d - keyCode != -2 && keyCode >= 37 && keyCode <= 40) { moveSnake(keyCode); } } //控制蛇移动方向 function moveSnake(keyCode) { var newSnake = []; var newCell = new cell(head.x, head.y, head.d); //头 //身体 for (var i = 1; i < snake.length; i++) { newSnake[i - 1] = snake[i]; } newSnake[snake.length - 1] = newCell; newCell.d = keyCode; switch (keyCode) { case 40: newCell.y++; break; //下 case 39: newCell.x++; break; //右 case 38: newCell.y--; break; //上 case 37: newCell.x--; break; //左 } snake = newSnake; head = snake[snake.length - 1]; checkDeath(); draw(); } //游戏规则 function checkDeath() { //超出边框 if (head.x >= 30 || head.y >= 30 || head.x < 0 || head.y < 0) { alert("Game over!"); window.location.reload(); } //咬到自己 for (var i = 0; i < snake.length - 1; i++) { if (head.x == snake[i].x && head.y == snake[i].y) { alert("Game over!"); window.location.reload(); } } } //蛇自动走 function moveClock() { moveSnake(head.d); } function beginGame() { setInterval(moveClock, 600); }

↑上面代码改变，会自动显示代码结果

jQuery调用版本：1.11.3

1、这个小游戏在html5的canvas标签中运行

2、使用原生的js代码，不需要jquery或者其它js插件

3、代码中有详细注释