<!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>
body { background-color:dimgray; margin:0; padding:0; font-family:Verdana; font-size:12px; font-weight:bold; color:white;}
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;}
.query{background-color:white;
color:black;
font-size:15;
width:700;
height:28;
margin:0 0 0 20;
}
.query:focus{background-color:white;
color:black;
font-size:15;
width:700;
height:28;
margin:0 0 0 20;
display: inline-block;
border: 2 solid #B6B6B6;
border-color: gainsboro gainsboro gainsboro gainsboro;
vertical-align: top;
transition:border linear .2s,box-shadow linear .5s;
-moz-transition:border linear .2s,-moz-box-shadow linear .5s;
-webkit-transition:border linear .2s,-webkit-box-shadow linear .5s;
outline:none;
border-color: deepskyblue;
box-shadow:0 0 1em deepskyblue;
-moz-box-shadow:0 0 1em deepskyblue;
-webkit-box-shadow:0 0 1em deepskyblue;
}
a{color:white;}
</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="";
this.pos.pop();
}
for( i=3;i<this.pos.length;i++ ){//从蛇的第四节开始判断是否撞到自己了 因为蛇头为两节 第三节不可能拐过来
if( this.pos.x == this.pos[0].x && this.pos.y == this.pos[0].y ){
this.die();
return;
}
}
this.domTab.rows[this.pos[0].y].cells[this.pos[0].x].className="shead";//画新头
this.domTab.rows[this.pos[1].y].cells[this.pos[1].x].className="sbody";//旧头变身体
};
Snake.prototype.die = function(){
alert("x_x Game Over!! Please try it. ");
window.clearInterval(this.timer);
this.init();
}
Snake.prototype.food = function(){//生成食物
if( this.foodPos.x == -1 ){//已存在时位置不变
do{
this.foodPos.y = Math.round( Math.random()*(this.rows-1) );
this.foodPos.x = Math.round( Math.random()*(this.cols-1) );
}
while( this.domTab.rows[this.foodPos.y].cells[this.foodPos.x].className != "" )//防止生成在蛇身上
}
this.domTab.rows[this.foodPos.y].cells[this.foodPos.x].className="sfood";
document.getElementById("foodNum").innerHTML=this.foodNum++;
};
Snake.prototype.map = function(){//创建地图
this.domTab.firstChild ? this.domTab.removeChild(this.domTab.firstChild) : false;//重新开始 删除tbody
for( j = 0; j < this.rows; j++ ){
var tr = this.domTab.insertRow(-1);
for( i = 0; i < this.cols; i++ ){
tr.insertCell(-1);
}
}
};
window.onload = function(){
var orz = new Snake();
orz.init();
document.onkeydown = function(e){ orz.trigger(e); };//firefox需要参数e
document.getElementById("setSpeed").onchange = function(){ this.blur(); orz.init(this.value); };
};
</script>
</head>
<body>
<ul class="info">
<li>Scores: <span id="foodNum"></span></li>
<li>Speed: <select id="setSpeed" class="query"><option value="200">Slow-speed(50)</option><option value="100">Medium-speed(100)</option><option value="50">Fast-speed(200)</option></select></li>
<li>Space: Start/Pause</li>
<li>Control: up, down, left and right keys</li>
</ul>
<table id="map"></table>
</body>
</html>