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贪吃蛇.html
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贪吃蛇.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>js小游戏之贪吃蛇</title>
<style>
div
{
margin:0 auto;
text-align:center;
}
#mcanvas
{
border:2px solid #0F6;
display:block;
margin:0 auto;
}
</style>
</head>
<body>
<div id="instruction">
<p style="font-size:18px;color:#03C;">分别由键盘的上下左右来控制蛇的移动方向</p>
</div>
<div id="main">
</div>
<script type="text/javascript">
var canvas = document.createElement('canvas');
canvas.id = "mcanvas";
canvas.width='800';
canvas.height='600';
document.body.appendChild(canvas);
var ctx=canvas.getContext('2d');
var foods
var snakes//放食物和蛇的数组
//初始化
function foodinit(x,y) //x,y代表坐标
{
var object=new Object();
object.x=x;
object.y=y;
ctx.fillStyle='red';
ctx.fillRect(x,y,10,10);
ctx.strokeStyle='#000000';
ctx.strokeRect(x,y,10,10);
return object;
}
//蛇身
function snakeinit(x,y)
{
var object=new Object();
object.x=x;
object.y=y;
ctx.fillStyle='blue';
ctx.fillRect(x,y,10,10);
ctx.strokeStyle='#000000';
ctx.strokeRect(x,y,10,10);
return object;
}
//蛇头
function snakeinith(x,y)
{
var object=new Object();
object.x=x;
object.y=y;
ctx.fillStyle='red';
ctx.fillRect(x,y,10,10);
ctx.strokeStyle='#000000';
ctx.strokeRect(x,y,10,10);
return object;
}
//画蛇
function sinit(x,y,len)
{
x=parseInt(x);
y=parseInt(y);
var snake=snakeinith(x,y);
x=x-10;
for(var i=1;i<len;i++)
{
var snake=snakeinit(x,y);
snakes.push(snake);
x=x-10;
}
}
function makesnake(x,y,length,speed)
{
this.x=x;
this.y=y;
this.len=length;
this.dir='R';
this.snakex=x;
this.snakey=y;
var head; //蛇头
var last;//蛇尾
var odir;
sinit(snakex,snakey,len);
document.onkeydown=function movedir(e)
{
odir=dir;
var code=0;
var e=e||event;
code=e.keyCode||e.which||e.charCode;
switch(code)
{
case 37:
dir="L";
break;
case 38:
dir="U";
break;
case 39:
dir="R";
break;
case 40:
dir="D";
break;
}
}
//移动蛇
function m()
{
if(snakes[0].x+10>canvas.width+5||snakes[0].x<0||snakes[0].y<0||snakes[0].y+10>canvas.height+5)
{
over();
return;
//游戏结束
}
else
{
if(dir=='R')
{
head=snakeinith(snakes[0].x+10,snakes[0].y);
snakeinit(snakes[0].x,snakes[0].y);
}
else if(dir=='L')
{
head=snakeinith(snakes[0].x-10,snakes[0].y);
snakeinit(snakes[0].x,snakes[0].y);
}
else if(dir=='D')
{
head=snakeinith(snakes[0].x,snakes[0].y+10);
snakeinit(snakes[0].x,snakes[0].y);
}
else if(dir=='U')
{
head=snakeinith(snakes[0].x,snakes[0].y-10);
snakeinit(snakes[0].x,snakes[0].y);
}
if(snakes[1].x==head.x&&snakes[1].y==head.y)
{
dir=odir;
if(dir=='R')
{
head=snakeinith(snakes[0].x+10,snakes[0].y);
}
else if(dir=='L')
{
head=snakeinith(snakes[0].x-10,snakes[0].y);
}
else if(dir=='D')
{
head=snakeinith(snakes[0].x,snakes[0].y+10);
}
else if(dir=='U')
{
head=snakeinith(snakes[0].x,snakes[0].y-10);
}
}
snakes.unshift(head);
last=snakes[len];
clear(last.x,last.y);
snakes.pop();
}
//判断食物是否和蛇头相撞
for (var i = 0;i<foods.length; i++)
{
if(foods[i].x == snakes[0].x&&foods[i].y == snakes[0].y)
{
foods.pop();
makefood();
var tail=snakeinit(last.x,last.y);
snakes.push(tail);
len++;
clearInterval(snake_interval);
if(speed>20)
{
speed=speed-8;
snake_interval=setInterval(m,speed);
}
//
}
}
for(var i=2;i<snakes.length;i++)
{
if(snakes[0].x==snakes[i].x&&snakes[0].y==snakes[i].y)
{
alert("撞到自己了！");
}
}
}
snake_interval=setInterval(m,speed);
}
//生成地图
function map()
{
ctx.fillStyle='#000000';
ctx.fillRect(0,0,canvas.width,canvas.height);
}
//生成食物
function makefood()
{
var x=parseInt(canvas.width/10*Math.random())*10;
var y=parseInt(canvas.height/10*Math.random())*10;
var food=new foodinit(x,y);
foods.push(food);
}
//清除
function clear(x,y)
{
ctx.fillStyle='#000000';
ctx.strokeStyle='#000000';
ctx.strokeRect(x,y,10,10);
ctx.fillRect(x,y,10,10);
}
function star()
{
foods=new Array();
snakes=new Array();
map();
document.getElementById("star").setAttribute('style',"display:none;");
document.getElementById("restar").setAttribute('style',"display:block;");
document.onkeydown=function movedir(e)
{
var code=0;
var e=e||event;
code=e.keyCode||e.which||e.charCode;
if(code!=0)
{
makefood ();
var x=(40/canvas.width)*canvas.width;
makesnake(x,x,3,100);
}
}
}
function over()
{
clearInterval(snake_interval);
alert("游戏结束！");
}
function restar()
{
clearInterval(snake_interval);
foods=new Array();
snakes=new Array();
map();
//document.getElementById("star").setAttribute('style',"display:none;");
document.onkeydown=function movedir(e)
{
var code=0;
var e=e||event;
code=e.keyCode||e.which||e.charCode;
if(code!=0)
{
makefood ();
var x=(40/canvas.width)*canvas.width;
makesnake(x,x,3,100);
}
}
}
</script>
<div id="star" style="display:block;">
<button type="button" onClick="star();">开始游戏</button>
</div>
<div id="restar" style="display:none;">
<button type="button" onClick="restar();">重新开始</button>
</div>
</body>
</html>