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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title> 贪吃蛇 </title>
<style>
#mapbox {
font-family: 宋体; font-size: 17px; line-height:100%;
height:360; width:430;
}
</style>
<script language="JavaScript">
/////////////////////
// 贪吃蛇 //
// OO+TextBox //
// 程序作者:海浪 //
// 2005-8-15 //
/////////////////////
var map;
var gott;
function play()
{
clearInterval(gott);
map = new mapClass(25,20);
document.onkeydown = keydown;
gott = setInterval("map.snake.go()",150);
}
function keydown()
{
switch (event.keyCode)
{
case 38: map.snake.refx(0); break;
case 39: map.snake.refx(1); break;
case 40: map.snake.refx(2); break;
case 37: map.snake.refx(3); break;
}
}
////////////////////////////////////////////
function mapClass(x,y)
{
this.x = x;
this.y = y;
this.sq = "■";
this.sk = "　";
this.marr = [];
for(var iy=0; iy<this.y; iy++)
{
this.marr[iy] = [];
for(var ix=0; ix<this.x; ix++)
this.marr[iy][ix] = (ix==0||iy==0||ix==this.x-1||iy==this.y-1)?this.sq:this.sk;
}
this.snake = new snakeClass(this);
this.bean = new beanClass(this);
this.bean.newbean();
this.bean.addn();
}
function mapClass.prototype.write()
{
var str = "";
for(var ii=0; ii<this.y; ii++)
str += this.marr[ii].join("")+"\n";
mapbox.innerText = str;
}
function mapClass.prototype.rexy(x,y,s)
{
var str = s || this.sk;
this.marr[y][x] = str;
}
function mapClass.prototype.jcxy(x,y,s)
{
var str = s || this.sk;
return this.marr[y][x] == str;
}
////////////////////////////////////////////
function snakeClass(po)
{
this.parent = po;
this.mt = "●";
this.boarr = [];
this.bolength = 4;
this.fang = 1;
this.fangtt = 1;
this.boarr[0] = this.addbody(3,5);
this.parent.rexy(this.boarr[0].x,this.boarr[0].y,this.mt);
}
function snakeClass.prototype.go()
{
this.fang = this.fangtt;
var x = this.boarr[0].x + [0,1,0,-1][this.fang];
var y = this.boarr[0].y + [-1,0,1,0][this.fang];
var chi = this.parent.jcxy(x,y,this.parent.bean.mt);
if(!this.parent.jcxy(x,y) && !chi)
{
clearInterval(gott);
alert("Game Over!");
return;
}
if(chi)
{
this.bolength++;
this.parent.bean.addn();
this.parent.bean.newbean();
}
this.parent.rexy(x,y,this.mt);
this.boarr = [].concat(this.addbody(x,y),this.boarr);
if(this.boarr.length>this.bolength)
{
var tb = this.boarr.pop();
this.parent.rexy(tb.x,tb.y);
}
this.parent.write();
}
function snakeClass.prototype.addbody(x,y)
{
return { x:x, y:y };
}
function snakeClass.prototype.refx(n)
{
if(Math.abs(this.fang-n)!=2)
this.fangtt=n;
}
////////////////////////////////////////////
function beanClass(po)
{
this.parent = po;
this.mt = "◎";
this.sne = -100;
}
function beanClass.prototype.addn()
{
this.sne+=100;
fan.innerText = this.sne;
}
function beanClass.prototype.newbean()
{
var x = Math.floor(Math.random()*(this.parent.x-2))+1;
var y = Math.floor(Math.random()*(this.parent.y-2))+1;
if(this.parent.jcxy(x,y))
this.parent.rexy(x,y,this.mt);
else
this.newbean();
}
</script>
</head>
<body>
<center>
<h2>贪吃蛇</h2><hr>
<div id="mapbox"></div>
<input type="button" value="开始" onclick="play()"> 得分：<span id="fan"></span>
<hr>
程序作者:海浪 2005-8-15
</center>
</body>
</html>

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