写的比较乱，有个逻辑错误：蛇吃了果果后应该是蛇尾加一节，写成了蛇头部增加一节- -。
可用键盘的上下左右键操作；
效果图：
代码如下：
<html>
<head>
<title>
贪吃蛇
</title>
<style type="text/css">
body{margin:0;padding:0;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;-webkit-user-select:none;
-moz-user-select:none;
-ms-user-select:none;
user-select:none;}
table{border-collapse:collapse;width:500px}
td{border:1px solid white;width:20px;height:20px;}
#wrap{width:500px;height:500px;background-color:#8B8386;margin:0 auto;position:absolute;border:1px solid #8B2500;}
#tar{width:20px;height:20px;position:absolute;background-color:#FFEE26;}
.num{width:20px;height:20px;background-color:#FDFF68;border:1px solid blue;border-radius:50%;position:absolute;}
input{color:red;font-size:20px;font-weight:bold;position:absolute;display:block;width:60px;height:35px;}
#btn2{top:45px;left:0px;}
#btn4{top:90px;left:70px;}
#btn1{top:45px;left:140px;}
#btn3{top:0px;left:70px;}
#btn{position:absolute;background-color:black;width:200px;height:125px;}
#txt{width:80px;height:55px;background-color:black;position:absolute;left:60px;top:35px;color:white;font-size:16px;font-weight:bold;line-height:55px;text-align:center;cursor:move;}
</style>
</head>
<body>
<div id="btn" style="left:520px;top:20px">
<input type="button" value="→" id="btn1"/>
<input type="button" value="←" id="btn2"/>
<input type="button" value="↑" id="btn3"/>
<input type="button" value="↓" id="btn4"/>
<div id="txt">点此拖动</div>
</div>
<div id="wrap" style="left:20px;top:20px">
<div id="tar"></div>
<table>
<tbody id="tb">
</tbody>
</table>
<div class="num"></div>
<div class="num"></div>
<div class="num"></div>
<div class="num"></div>
<div class="num"></div>
</div>
<script type="text/javascript">
var tb=document.getElementById('tb');
var wrap=document.getElementById('wrap');
var tr=new Array();
var td=new Array();
for(var i=0;i<25;i++) //绘制地图
{
tr[i]=document.createElement('tr');
tb.appendChild(tr[i]);
for(var j=0;j<25;j++)
{
td[j]=document.createElement('td');
tr[i].appendChild(td[j]);
}
}
var tar=document.getElementById('tar'); //食物定位
function food()
{
var a,b;
a=Math.random()*460;
a=Math.floor(a/20)*20+20;
b=Math.random()*460;
b=Math.floor(b/20)*20+20;
tar.style.left=a+"px";
tar.style.top=b+"px";
}
food();
var s=document.getElementsByClassName('num'); //定位蛇的位置
s[0].style.backgroundColor="#3EFF1A";
var x=300,y=400,f,d,p,Fraction=0,t=600,tt=60;
for(var k=0;k<s.length;k++)
{
s[k].style.left=x+"px";
s[k].style.top=y+20*k+"px";
}
function move(obj,direction) //控制移动函数开始
{
clearTimeout(d);
s=document.getElementsByClassName('num');
var l=new Array();
l[0]=s[0].style.left;
var w=new Array();
w[0]=s[0].style.top;
obj; //移动方向
s[0].style.left=x+"px";
s[0].style.top=y+"px";
for(var k1=1;k1<s.length;k1++)
{
l[k1]=s[k1].style.left;
w[k1]=s[k1].style.top;
s[k1].style.left=l[k1-1];
s[k1].style.top=w[k1-1];
}
if(parseInt(s[0].style.left)==parseInt(tar.style.left)&&parseInt(s[0].style.top)==parseInt(tar.style.top))
{
t=t-tt;
tt-=5;
if(tt==0)tt=5;
var new_div=document.createElement('div');
new_div.className="num";
Fraction+=100;
if(p==1)
{
new_div.style.top=s[0].style.top;
new_div.style.left=parseInt(s[0].style.left)+20+"px";
}
if(p==2)
{
new_div.style.top=s[0].style.top;
new_div.style.left=parseInt(s[0].style.left)-20+"px";
}
if(p==3)
{
new_div.style.left=s[0].style.left;
new_div.style.top=parseInt(s[0].style.top)-20+"px";
}
if(p==4)
{
new_div.style.left=s[0].style.left;
new_div.style.top=parseInt(s[0].style.top)+20+"px";
}
s[0].parentNode.insertBefore(new_div,s[0]);
food();
s[0].style.backgroundColor="#3EFF1A";
for(var k=1;k<s.length;k++)
{
s[k].style.backgroundColor="#FDFF68";
}
}
if(parseInt(s[0].style.left)<0||parseInt(s[0].style.left)>=500||parseInt(s[0].style.top)<0||parseInt(s[0].style.top)>=500)
{
alert("GAME OVER！"+"你的分数为："+Fraction+"分");
food();
x=300;
y=400;
for(var k=0;k<5;k++)
{
s[k].style.left=x+"px";
s[k].style.top=y+20*k+"px";
}
for(var kk=s.length-1;kk>4;kk--)
{
s[kk].parentNode.removeChild(s[kk]);
}
t=700;
tt=60;
return false;
}
for(k=1;k<s.length;k++)
{
if(parseInt(s[0].style.left)==parseInt(s[k].style.left)&&parseInt(s[0].style.top)==parseInt(s[k].style.top))
{
alert("GAME OVER！"+"你的分数为："+Fraction+"分");
food();
x=300;
y=400;
for(var k=0;k<5;k++)
{
s[k].style.left=x+"px";
s[k].style.top=y+20*k+"px";
}
for(var kk=s.length-1;kk>4;kk--)
{
s[kk].parentNode.removeChild(s[kk]);
}
t=700;
tt=60;
return false;
}
}
d=setTimeout(direction,t);
}
document.getElementById('btn1').onclick=function R() //绑定鼠标点击事件
{
x=parseInt(s[0].style.left);
y=parseInt(s[0].style.top);
if(parseInt(s[0].style.left)<parseInt(s[1].style.left))return false;
p=1;
move(x=x+20,R);
}
document.getElementById('btn2').onclick=function L()
{
x=parseInt(s[0].style.left);
y=parseInt(s[0].style.top);
if(parseInt(s[0].style.left)>parseInt(s[1].style.left))return false;
p=2;
move(x=x-20,L);
}
document.getElementById('btn3').onclick=function T()
{
x=parseInt(s[0].style.left);
y=parseInt(s[0].style.top);
if(parseInt(s[0].style.top)>parseInt(s[1].style.top))return false;
p=3;
move(y=y-20,T);
}
document.getElementById('btn4').onclick=function B()
{
x=parseInt(s[0].style.left);
y=parseInt(s[0].style.top);
if(parseInt(s[0].style.top)<parseInt(s[1].style.top))return false;
p=4;
move(y=y+20,B);
}
document.onkeydown=function(event) //绑定键盘事件
{
var e=event||window.event;
if(e&&e.keyCode==39)
{
function R()
{
x=parseInt(s[0].style.left);
y=parseInt(s[0].style.top);
if(parseInt(s[0].style.left)<parseInt(s[1].style.left))return false;
p=1;
move(x=x+20,R);
}
R();
return false;
}
if(e&&e.keyCode==37)
{
function L()
{
x=parseInt(s[0].style.left);
y=parseInt(s[0].style.top);
if(parseInt(s[0].style.left)>parseInt(s[1].style.left))return false;
p=2;
move(x=x-20,L);
}
L();
return false;
}
if(e&&e.keyCode==38)
{
function T()
{
x=parseInt(s[0].style.left);
y=parseInt(s[0].style.top);
if(parseInt(s[0].style.top)>parseInt(s[1].style.top))return false;
p=3;
move(y=y-20,T);
}
T();
return false;
}
if(e&&e.keyCode==40)
{
function B()
{
x=parseInt(s[0].style.left);
y=parseInt(s[0].style.top);
if(parseInt(s[0].style.top)<parseInt(s[1].style.top))return false;
p=4;
move(y=y+20,B);
}
B();
return false;
}
}
var btn=document.getElementById('btn');
var btn_l,btn_t;
function btn_move()
{
btn_l=clientX-parseInt(wrap.style.left)
}
confirm("可用键盘的上下左右四个按键进行游戏操作！")
var btn=document.getElementById('btn'); //开始制作操作区拖动效果
var txt=document.getElementById('txt');
var new_x,new_y,bool=false;
txt.onmousedown=function ()
{
var eve=event||window.event;
bool=true;
new_x=eve.clientX-parseInt(btn.style.left);
new_y=eve.clientY-parseInt(btn.style.top);
}
btn.onmousemove=function btn_move(event)
{
if(bool)
{
var e=event||window.event;
btn.style.left=e.clientX-new_x;
btn.style.top=e.clientY-new_y;
if(parseInt(btn.style.left)<520)btn.style.left="520px";
if(parseInt(btn.style.top)<0)btn.style.top="0px";
if(parseInt(btn.style.top)>395)btn.style.top="395px";
}
}
document.body.onmouseup=function()
{
bool=false;
}
</script>
</body>
</html>
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