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复制代码
<!DOCTYPE html>
<html>
<head>
<title>贪吃蛇</title>
<meta charset="UTF-8">
<meta name="keywords" content="贪吃蛇">
<meta name="Description" content="这是一个初学者用来学习的小游戏">
<style type="text/css">
*{margin:0;}
.map{margin:100px auto;
height:600px;
width:900px;
background:pink;
border:10px solid #AFAEB2;
border-radius:8px;
}
</style>
</head>
<body>
<div class="map">
<canvas id="canvas" height="600" width="900">
</canvas>
</div>
<script type="text/javascript">
//获取绘制工具
/*
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");//获取上下文
ctx.moveTo(0,0);
ctx.lineTo(450,450);*/
var c=document.getElementById("canvas");
var ctx=c.getContext("2d");
/*ctx.beginPath();
ctx.moveTo(0,0);
ctx.lineTo(450,450);
ctx.stroke();
*/
var snake =[];//定义一条蛇，画蛇的身体
var snakeCount = 6;//初始化蛇的长度
var foodx =0;
var foody =0;
var togo =0;
function drawtable()//画地图的函数
{
for(var i=0;i<60;i++)//画竖线
{
ctx.strokeStyle="black";
ctx.beginPath();
ctx.moveTo(15*i,0);
ctx.lineTo(15*i,600);
ctx.closePath();
ctx.stroke();
}
for(var j=0;j<40;j++)//画横线
{
ctx.strokeStyle="black";
ctx.beginPath();
ctx.moveTo(0,15*j);
ctx.lineTo(900,15*j);
ctx.closePath();
ctx.stroke();
}
for(var k=0;k<snakeCount;k++)//画蛇的身体
{
ctx.fillStyle="#000";
if (k==snakeCount-1)
{
ctx.fillStyle="red";//蛇头的颜色与身体区分开
}
ctx.fillRect(snake[k].x,snake[k].y,15,15);//前两个数是矩形的起始坐标，后两个数是矩形的长宽。
}
//绘制食物
ctx.fillStyle ="black";
ctx.fillRect(foodx,foody,15,15);
ctx.fill();
}
function start()//定义蛇的坐标
{
//var snake =[];//定义一条蛇，画蛇的身体
//var snakeCount = 6;//初始化蛇的长度
for(var k=0;k<snakeCount;k++)
{
snake[k]={x:k*15,y:0};
}
drawtable();
addfood();//在start中调用添加食物函数
}
function addfood()
{
foodx = Math.floor(Math.random()*60)*15; //随机产生一个0-1之间的数
foody = Math.floor(Math.random()*40)*15;
for (var k=0;k<snake;k++)
{
if (foodx==snake[k].x&&foody==sanke[k].y)//防止产生的随机食物落在蛇身上
{
addfood();
}
}
}
function move()
{
switch (togo)
{
case 1: snake.push({x:snake[snakeCount-1].x-15,y:snake[snakeCount-1].y}); break;//向左走
case 2: snake.push({x:snake[snakeCount-1].x,y:snake[snakeCount-1].y-15}); break;
case 3: snake.push({x:snake[snakeCount-1].x+15,y:snake[snakeCount-1].y}); break;
case 4: snake.push({x:snake[snakeCount-1].x,y:snake[snakeCount-1].y+15}); break;
case 5: snake.push({x:snake[snakeCount-1].x-15,y:snake[snakeCount-1].y-15}); break;
case 6: snake.push({x:snake[snakeCount-1].x+15,y:snake[snakeCount-1].y+15}); break;
default: snake.push({x:snake[snakeCount-1].x+15,y:snake[snakeCount-1].y});
}
snake.shift();//删除数组第一个元素
ctx.clearRect(0,0,900,600);//清除画布重新绘制
isEat();
isDead();
drawtable();
}
function keydown(e)
{
switch(e.keyCode)
{
case 37: togo=1; break;
case 38: togo=2; break;
case 39: togo=3; break;
case 40: togo=4; break;
case 65: togo=5; break;
case 68: togo=6; break;
}
}
function isEat()//吃到食物后长度加1
{
if(snake[snakeCount-1].x==foodx&&snake[snakeCount-1].y==foody)
{
addfood();
snakeCount++;
snake.unshift({x:-15,y:-15});
}
}
function isDead()
{
if (snake[snakeCount-1].x>885||snake[snakeCount-1].y>585||snake[snakeCount-1].x<0||snake[snakeCount-1].y<0)
{
alert("You are dead,GAME OVER!!!");
window.location.reload();
}
}
document.onkeydown=function(e)
{
keydown(e);
}
window.onload = function()//调用函数
{
start();
setInterval(move,150);
drawtable();
}
</script>
</body>
</html>
