自己写的第一个小游戏，花了很长时间修改，优化时参考了一些现成的代码，但还是有bug和一些问题
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Snake</title>
<style>
* { margin:0; padding:0; font-family:Verdana,宋体; font-size:12px;}
table#map { width:auto; height:auto; margin:0 auto; border-collapse:collapse; border-spacing:0; background-color:#EAEAEA; clear:both;}
td { width:10px; height:10px; border:1px solid black;}
.shead { background-color:orangered;}
.sbody { background-color:black;}
.sfood { background-color:orangered;}
.info { width:400px; margin:0 auto; padding:3em 0;}
.info li{ float:left; height:30px; margin-right:2em; line-height:30px;}
</style>
<script type="text/javascript" language="javascript">
function Snake(){
this.rows = 20;
this.cols = 40;
this.speed = 200;
this.currKey = 0;//当前方向
this.timer = 0;
this.sid = "snakeObj"+parseInt(Math.random()*100000);
eval(this.sid+"=this");
this.pos = [];//蛇身
this.foodPos = {"x":-1,"y":-1};
this.foodNum = 0;
this.domTab = document.getElementById("map");//地图
this.pause = 1;//1,-1
}
Snake.prototype.init = function(){
this.map();
arguments[0] ? this.speed=arguments[0] : false;//选择速度
this.pos = [{"x":2,"y":5},{"x":1,"y":5},{"x":0,"y":5}];
for( j in this.pos ){//画全身,move只画头尾
this.domTab.rows[this.pos[j].y].cells[this.pos[j].x].className="sbody";
}
this.domTab.rows[this.pos[0].y].cells[this.pos[0].x].className="shead";
this.currKey = 0;
this.foodNum = 0;
this.food();
this.pause = 1;
}
Snake.prototype.trigger = function(e){
var e = e||event;
var eKey = e.keyCode||e.which||e.charCode;
if( eKey>=37 && eKey<=40 && eKey!=this.currKey && !( (this.currKey == 37 && eKey == 39) || (this.currKey == 38 && eKey == 40) || (this.currKey == 39 && eKey == 37) || (this.currKey == 40 && eKey == 38) ) && this.pause==-1 ){//响应:上下左右 & 不是当前方向 & 不是反方向 & 不在暂停状态
this.currKey = eKey;
}else if( eKey==32 ){//空格:暂停,开始
this.currKey = (this.currKey==0) ? 39 : this.currKey;
((this.pause*=-1)==-1) ? this.timer=window.setInterval(this.sid+".move()",this.speed) : window.clearInterval(this.timer);
}
};
Snake.prototype.move = function(){//画头、删尾巴、蛇身不动
switch(this.currKey){
case 37:
if( this.pos[0].x <= 0 ){ this.die(); return; }//撞墙
else{ this.pos.unshift( {"x":this.pos[0].x-1,"y":this.pos[0].y}); }//加蛇头
break;//left
case 38:
if( this.pos[0].y <= 0 ){ this.die(); return; }
else{ this.pos.unshift( {"x":this.pos[0].x,"y":this.pos[0].y-1}); }
break;//up
case 39:
if( this.pos[0].x >= this.cols-1 ){ this.die(); return; }
else{ this.pos.unshift( {"x":this.pos[0].x+1,"y":this.pos[0].y}); }
break;//right
case 40:
if( this.pos[0].y >= this.rows-1 ){ this.die(); return; }
else{ this.pos.unshift( {"x":this.pos[0].x,"y":this.pos[0].y+1}); }
break;//down
};
if( this.pos[0].x == this.foodPos.x && this.pos[0].y == this.foodPos.y ){//吃到食物
this.foodPos.x = -1;//食物被吃,不删蛇尾
this.food();
}else if( this.currKey != 0 ){//删蛇尾,init时不删
this.domTab.rows[this.pos[this.pos.length-1].y].cells[this.pos[this.pos.length-1].x].className="";