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简单的贪吃蛇

(function() {

var canvas = document.getElementById("canvas");
var ctx = canvas.getContext(‘2d‘);
ctx.fillStyle = "#0f0";
ctx.strokeStyle = "#f00";

//按下键盘的响应参数
var keyList = {
37: [-1,0],
38: [0,-1],
39: [1,0],
40: [0,1]
};

var snake = {
options: {
canvasSize: 300,
length: 5, //贪食蛇初始块数
speed: 10, //每次移动10个像素
width: 10, //每块是10*10的正方形
array: [[4,0],[3,0],[2,0],[1,0],[0,0]], //蛇分块
keyCode: 39, //初始默认蛇往右移动
forward: [], //蛇的前进方向
food: [],
gameOver: false,
score: 0
},
draw: function() {
ctx.clearRect(0, 0, this.options.canvasSize, this.options.canvasSize);
var len = this.options.array.length;
for(var i = len - 1; i >= 0; i--){
this.drawDot(this.options.array[i]);
}
this.drawDot(this.options.food);

},
//注意：生成的食物不要在蛇身上
createFood: function() {
var Rand1 = Math.random();
var Rand2 = Math.random();
var num = (this.options.canvasSize - this.options.width) / 10;
var left = Math.floor(num*Rand1);
var top = Math.floor(num*Rand2);
for(var i = this.options.array.length - 1; i >=0; i--) {
if(left == this.options.array[i][0] && top == this.options.array[i][1])
{
createFood();
return;
}
}
this.options.food = [left, top];
},
go: function() {
var len = this.options.array.length;
var keyCode = this.options.keyCode;
if(keyList[keyCode] && this.options.forward[0] != keyList[keyCode][0] && this.options.forward[1] != keyList[keyCode][1])
this.options.forward = keyList[keyCode];

for(var i = len - 1; i > 0; i--) {
this.options.array[i][0] = this.options.array[i-1][0];
this.options.array[i][1] = this.options.array[i-1][1];
}

this.options.array[0][0] += this.options.forward[0];
this.options.array[0][1] += this.options.forward[1];
this.gameOver(); //检测有没有碰撞
this.eatFood();
},
drawDot: function(pos) {
ctx.fillRect(pos[0]*10, pos[1]*10, this.options.width, this.options.width);
ctx.strokeRect(pos[0]*10, pos[1]*10, this.options.width, this.options.width);
},
gameOver: function() {
var len = this.options.array.length;
if(this.options.array[0][0] < 0 || this.options.array[0][1] < 0 || this.options.array[0][0] >= this.options.canvasSize / 10 || this.options.array[0][1] >= this.options.canvasSize / 10)
{
this.options.gameOver = true;
return;
}
for(var i = len - 1; i > 0; i--) {
if(this.options.array[0][0] == this.options.array[i][0] && this.options.array[0][1] == this.options.array[i][1])
this.options.gameOver = true;
}
},
eatFood: function() {
var len = this.options.array.length;
var last = [this.options.array[len-1][0], this.options.array[len-1][1]];
if(this.options.food[0] == this.options.array[0][0] && this.options.food[1] == this.options.array[0][1])
{
this.options.array.push(last);

this.options.score += 10;
scoreInput.value = this.options.score;

this.createFood();
}

}

};

var boxHeight = document.documentElement.clientHeight;
var boxWidth = document.documentElement.clientWidth;
var popBox = document.createElement("div");
document.body.appendChild(popBox);
popBox.style.cssText = "width:" + boxWidth +"px; height:" + boxHeight + "px;background:rgba(2,187,153,0.3);display:none;z-index:5;position:absolute;top:0;left:0;";

var p = document.createElement("p");
p.innerHTML = "<h2>Sorry~</h2>";
popBox.appendChild(p);
p.style.cssText = "position:absolute;top:" + (boxHeight/2-19) +"px;left:"+ (boxWidth/2-50) +"px;";

var a = document.createElement("a");
a.innerHTML = "<h1>再来一局！</h1>";
popBox.appendChild(a);
a.style.cssText = "color:red;position:absolute;top:" + (boxHeight/2+10) +"px;left:"+ (boxWidth/2-90) +"px;cursor:pointer;";

function pop() {
popBox.style.display = "block";
a.onclick = function() {
popBox.style.display = "none";
snake.options.array = [[4,0],[3,0],[2,0],[1,0],[0,0]];
snake.options.gameOver = false;
snake.options.forward = [1,0];
snake.options.keyCode = 39;
snake.options.score = 0;
scoreInput.value = 0;
snake.createFood();
loop();
}
}

document.body.onkeydown = function(e) {
e = e||window.event;
var keyCode = e.keyCode;
snake.options.keyCode = keyCode;
}

var scoreInput = document.getElementById("score");
snake.createFood();
loop();
function loop() {
if(snake.options.gameOver)
{
pop();return;
}
snake.go();
snake.draw();
setTimeout(loop,200);
}
})();

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原文地址：http://www.cnblogs.com/ckx961122/p/5415137.html