1、注意，自己引入jquery,这个demo基于jquery的，我的jquery是写的本地的
2、没有写注释，看不懂的再问我吧，
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
* {
padding: 0;
margin: 0;
}
div.wrap {
text-align: center;
padding-top: 50px;
}
div.container {
display: inline-block;
border: 1px solid rgba(0, 0, 0, 0.2);
}
div.row {
display: flex;
}
div.row div {
width: 20px;
height: 20px;
border: 1px solid rgba(0, 0, 0, 0.2);
}
div.row div.snake {
background: #26376b;
}
div.row div.snakeHeader {
background: red;
}
div.row div.food {
background: greenyellow;
}
div.grade {}
</style>
</head>
<body>
<div class="wrap">
<button class="btn">从新开始</button>
<div class="grade">
0
</div>
<div class="container">
</div>
</div>
</body>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript">
function snakeCreate(wrap, grade) {
var fn = {},
$wrap = $(wrap),
$row = null;
var direct = "up";
var count = 0;
var data = [];
var food = {
x: 0,
y: 0
};
var gameRun = true;
var snake = [{
x: 9,
y: 10
}, {
x: 10,
y: 10
}, {
x: 11,
y: 10
}, {
x: 12,
y: 10
}];
fn.init = function() {
fn.keyCode();
fn.createDom();
fn.config();
fn.createFood();
fn.display();
};
fn.createDom = function() {
for(var i = 0; i < 21; i++) {
$wrap.append(‘<div class="row"></div>‘);
for(var j = 0; j < 21; j++) {
$wrap.find(".row").last().append("<div></div>");
}
}
$row = $wrap.find(".row");
};
fn.config = function() {
for(var i = 0; i < 21; i++) {
var temp = [];
for(var j = 0; j < 21; j++) {
temp.push(0);
}
data.push(temp);
}
for(var i = 0; i < snake.length; i++) {
data[snake[i].x][snake[i].y] = 2;
}
};
fn.display = function() {
for(var i = 0; i < data.length; i++) {
for(var j = 0; j < data.length; j++) {
var className = "";
if(data[i][j] == 0) {
className = "";
} else if(data[i][j] == 2) {
className = "snake";
} else if(data[i][j] == 1) {
className = "food";
} else {
className = "";
}
$row.eq(i).find("div").eq(j)[0].className = className;
$row.eq(snake[0].x).find("div").eq(snake[0].y)[0].className = "snakeHeader";
}
}
};
fn.keyCode = function() {
$(window).on("keydown", function(event) {
if(gameRun) {
switch(event.key) {
case "w":
fn.moveToUp();
break;
case "s":
fn.moveToDown();
break;
case "a":
fn.moveToLeft();
break;
case "d":
fn.moveToRight();
break;
default:
break;
}
}
});
};
fn.change = function(x, y) {
fn.judegDeth(x, y);
if(gameRun) {
data[snake[snake.length - 1].x][snake[snake.length - 1].y] = 0;
data[x][y] = 2;
if(x == food.x && y == food.y) {
var feed = {
x: x,
y: y
}
$(grade).html($(grade).html() * 1 + 1);
snake.push(feed);
fn.createFood();
}
for(var i = snake.length - 1; i > 0; i--) {
snake[i].x = snake[i - 1].x;
snake[i].y = snake[i - 1].y;
}
for(var i = 0; i < snake.length; i++) {
data[snake[i].x][snake[i].y] = 2;
}
snake[0].x = x;
snake[0].y = y;
fn.display();
}
};
fn.moveToUp = function() {
if(direct != "down") {
direct = "up";
fn.outMove(-1, 0);
}
};
fn.moveToDown = function() {
if(direct != "up") {
direct = "down";
fn.outMove(1, 0);
}
};
fn.moveToLeft = function() {
if(direct != "right") {
direct = "left";
fn.outMove(0, -1);
}
};
fn.moveToRight = function() {
if(direct != "left") {
direct = "right";
fn.outMove(0, 1);
}
};
fn.outMove = function(speedx, speedy) {
clearInterval(fn.timer);
fn.change(snake[0].x + speedx, snake[0].y + speedy);
fn.timer = setInterval(function() {
fn.change(snake[0].x + speedx, snake[0].y + speedy);
}, 400);
};
fn.createFood = function() {
var x = Math.floor(Math.random() * 21);
var y = Math.floor(Math.random() * 21);
while(data[x][y] != 0) {
x = Math.floor(Math.random() * 21);
y = Math.floor(Math.random() * 21);
}
food.x = x;
food.y = y;
data[x][y] = 1;
};
fn.judegDeth = function(x, y) {
if(gameRun) {
fn.judegBound(x, y);
fn.judgeOver(x, y);
}
};
fn.judegBound = function(x, y) {
if(x >= 21 || x < 0 || y >= 21 || y < 0) {
clearInterval(fn.timer);
gameRun = false;
alert("game over1!");
}
};
fn.judgeOver = function(x, y) {
for(var i = 0; i < snake.length; i++) {
if(snake[i].x == x && snake[i].y == y) {
clearInterval(fn.timer);
gameRun = false;
alert("game over2!");
break;
}
}
};
fn.clear = function() {
clearInterval(fn.timer);
count = 0;
direct = "up";
food = {
x: 0,
y: 0
};
$(grade).html(0);
gameRun = true;
snake = [{
x: 9,
y: 10
}, {
x: 10,
y: 10
}, {
x: 11,
y: 10
}, {
x: 12,
y: 10
}];
for(var i = 0; i < data.length; i++) {
for(var j = 0; j < data.length; j++) {
data[i][j] = 0;
}
}
for(var i = 0; i < snake.length; i++) {
data[snake[i].x][snake[i].y] = 2;
}
fn.createFood();
fn.display();
};
return fn;
}
var snakeOne = snakeCreate(".container", ".grade");
snakeOne.init();
$(".btn").on("click", function() {
snakeOne.clear();
});
</script>
</html>
原文：http://www.cnblogs.com/muamaker/p/6238327.html