第一種：
樣式圖：
全部代碼：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>snake</title>
</head>
<body style="text-align: center;margin: 200px;background-color: aliceblue;">
<canvas id="cnv" width="400px" height="400px" style="background-color: antiquewhite;"></canvas>
<script type="text/javascript">
//變量聲明
var box = document.getElementById("cnv").getContext("2d");
var snake;
var direction;
var n;
var food;
//繪製地圖
function draw(point,color){
box.fillStyle = color;
box.fillRect(point%20*20+1,~~(point/20)*20+1,18,18);
}
(function(){ready();}());
function ready(){
for(var i=0;i<400;i++){
draw(i,"#313131");
}
snake=[66,65,64];
direction=1;
food=344;
draw(food,"yellow");
draw(66,"#00b7ee");
draw(65,"#00b7ee");
draw(64,"#00b7ee");
}
//核心算法
function run(){
document.getElementById("butn").setAttribute("disabled",true);
snake.unshift(n=snake[0]+direction);
if(snake.indexOf(n,1)>0||n<0||n>399||(direction==-1&&n%20==19)||(direction==1&&n%20==0)){
ready();
document.getElementById("butn").removeAttribute("disabled");
return alert("game over");
}
draw(n,"#00b7ee");
if(n==food){
while(snake.indexOf(food=~~(Math.random()*400))>0);
draw(food,"yellow");
}
else{
draw(snake.pop(),"#313131");
}
setTimeout(arguments.callee,200);
}
//鍵盤事件
document.onkeydown=function(e){
if (direction==1||direction==-1){
if(e.keyCode==38||e.keyCode==87){
direction=-20;
}
if(e.keyCode==40||e.keyCode==83){
direction=20;
}
}
if(direction==20||direction==-20){
if(e.keyCode==39||e.keyCode==68){
direction=1;
}
if(e.keyCode==37||e.keyCode==65){
direction=-1;
}
}
}
</script>
<div>
<button id="butn" type="button" onclick="run()">開始遊戲</button>
</div>
</body>
</html>
第二種：
全部代碼：
<!DOCTYPE HTML>
<html>
<meta charset="utf-8">
<body>
<canvas id="myCanvas" width="400" height="400" style="border:1px solid #c3c3c3;"></canvas>
<script type="text/javascript">
var c=document.getElementById("myCanvas");
var time = 160 ; //蛇的速度
var cxt=c.getContext("2d");
var x = y = 8;
var a = 0; //食物座標
var t = 10; //蛇身長
var map = []; //記錄蛇運行路徑
var size = 8; //蛇身單元大小
var direction = 2; // 1 向上 2 向右 0 左 3下
interval = window.setInterval(set_game_speed, time); // 移動蛇
function set_game_speed(){ // 移動蛇
switch(direction){
case 1:y = y-size;break;
case 2:x = x+size;break;
case 0:x = x-size;break;
case 3:y = y+size;break;
}
if(x>400 || y>400 || x<0 || y<0){
alert("遊戲失敗！");window.location.reload();
}
for(var i=0;i<map.length;i++){
if( parseInt(map[i].x)==x && parseInt(map[i].y)==y){
alert("遊戲失敗！");window.location.reload();
}
}
if (map.length>t) { //保持捨身長度
var cl = map.shift(); //刪除數組第一項，並且返回原元素
cxt.clearRect(cl['x'], cl['y'], size, size);
};
map.push({'x':x,'y':y}); //將數據添加到原數組尾部
cxt.fillStyle = "#006699";//內部填充顏色
cxt.strokeStyle = "#006699";//邊框顏色
cxt.fillRect(x, y, size, size);//繪製矩形
if((a*8)==x && (a*8)==y){ //喫食物
rand_frog();t++;
}
}
document.onkeydown = function(e) { //改變蛇方向
var code = e.keyCode - 37;
switch(code){
case 1 : direction = 1;break;//上
case 2 : direction = 2;break;//右
case 3 : direction = 3;break;//下
case 0 : direction = 0;break;//左
}
}
// 隨機放置食物
function rand_frog(){
a = Math.ceil(Math.random()*50);
cxt.fillStyle = "#000000";//內部填充顏色
cxt.strokeStyle = "#000000";//邊框顏色
cxt.fillRect(a*8, a*8, 8, 8);//繪製矩形
}
// 隨機放置食物
rand_frog();
</script>
</body>
</html>
效果展示：
