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index.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>贪吃蛇</title>
<style>
*{margin:0;padding:0;}
#box{width:600px;
height:500px;
border:1px solid #f00;
position:absolute;
top:0;
left:0;
bottom:0;
right:0;
margin:auto;
font-size:0;}
.map{width:20px;
height:20px;
display:inline-block;
border:1px solid #ccc;
box-sizing:border-box;}
.food,.snake{width:20px;
height:20px;
position:absolute;}
.food{background:#f00;}
.snake{background:#000;
top:0;
left:0;}
#count{width:200px;
height:150px;
border:2px solid red;
position:absolute;
left:600px;
top:-1px;
z-index:10;
font-size:20px;}
#count ul{list-style:none;}
</style>
<script>
var DIR={
DIR_LEFT:1,
DIR_TOP:2,
DIR_RIGHT:3,
DIR_BOTTOM:4
};
var square={width:20,height:20};
var Map={
show:function(){
var box=document.getElementById("box");
var width=box.offsetWidth-2;
var height=box.offsetHeight-2;
var hMax=width/square.width;
var vMax=height/square.height;
for(var i=0;i<hMax*vMax;i++){
var newSpan=document.createElement("span");
newSpan.className="map";
box.appendChild(newSpan);
}
}
}
var Snake={
handler:null,
speed:1000,
dirc:DIR.DIR_RIGHT,
bodys:[],
isValidPosition:function(left,top){
for(var i=0;i<this.bodys.length;i++){
if(this.bodys[i].offsetTop==top && this.bodys[i].offsetLeft==left){
return false;
}
}
return true;
},
addBody:function(left,top){
var newBody=document.createElement("span");
newBody.className="snake";
newBody.style.top=top+"px";
newBody.style.left=left+"px";
document.getElementById("box").appendChild(newBody);
this.bodys.push(newBody);
Install.count();
},
moveOrNot:function(left,top){
if(!this.isValidPosition(left,top)){
return false;
}
var box=document.getElementById("box");
if(left<0 || top<0 || left>box.offsetWidth-square.width || top>box.offsetHeight-square.height){
return false;
}
return true;
},
// 初始化蛇
init:function(length){
var box=document.getElementById("box");
for(var i=0;i<length;i++){
var newSpan=document.createElement("span");
newSpan.className="snake";
newSpan.style.left=i*square.width+"px";
box.appendChild(newSpan);
this.bodys.unshift(newSpan);
}
this.bodys[0].style.backgroundColor="#f00";
// 绑定方向控制
document.onkeydown=function(e){
switch(e.keyCode){
case 37:
Snake.dirc=DIR.DIR_LEFT;
break;
case 38:
Snake.dirc=DIR.DIR_TOP;
break;
case 39:
Snake.dirc=DIR.DIR_RIGHT;
break;
case 40:
Snake.dirc=DIR.DIR_BOTTOM;
break;
default:break;
}
}
},
// 移动蛇
move:function(){
var rearLeft=this.bodys[this.bodys.length-1].offsetLeft;
var rearTop=this.bodys[this.bodys.length-1].offsetTop;
// 让蛇头以外的元素移动
for(var i=this.bodys.length-1;i>=1;i--){
this.bodys[i].style.top=this.bodys[i-1].offsetTop+"px";
this.bodys[i].style.left=this.bodys[i-1].offsetLeft+"px";
}
var newLeft=this.bodys[0].offsetLeft;
var newTop=this.bodys[0].offsetTop;
// 让蛇头移动
switch(this.dirc){
case DIR.DIR_LEFT:
newLeft-=square.width;
break;
case DIR.DIR_TOP:
newTop-=square.height;
break;
case DIR.DIR_RIGHT:
newLeft+=square.width;
break;
case DIR.DIR_BOTTOM:
newTop+=square.height;
break;
default:break;
}
if(!this.moveOrNot(newLeft,newTop)){
clearInterval(this.handler);
alert("Game Over!\n您的得分："+Install.score);
return;
}
this.bodys[0].style.left=newLeft+"px";
this.bodys[0].style.top=newTop+"px";
if(newTop==Food.food.offsetTop && newLeft==Food.food.offsetLeft){
this.addBody(rearLeft,rearTop);
Food.reset();
clearInterval(this.handler);
this.speed=this.speed-100>100?this.speed-100:100;
this.handler=setInterval(function(){Snake.move();},this.speed);
}
}
};
var Food={
food:null,
reset:function(){
document.getElementById("box").removeChild(this.food);
this.food=null;
this.show();
},
show:function(){
var box=document.getElementById("box");
var width=box.offsetWidth-2;
var height=box.offsetHeight-2;
var hMax=width/square.width;
var vMax=height/square.height;
this.food=document.createElement("span");
this.food.className="food";
do{
var top=Math.floor(Math.random()*vMax)*square.height;
var left=Math.floor(Math.random()*hMax)*square.width;
}while(!Snake.isValidPosition(left,top))
this.food.style.top=top+"px";
this.food.style.left=left+"px";
box.appendChild(this.food);
}
}
var Install={
// 控制暂停和开始
score:0,
control:function(){
var submit=document.getElementById("count").getElementsByTagName("li")[0];
submit.onclick=function(){
if(submit.getElementsByTagName("span")[0].innerHTML=="暂停:"){
clearInterval(Snake.handler);
submit.getElementsByTagName("span")[0].innerHTML="继续:";
submit.getElementsByTagName("input")[0].setAttribute("value","继续");
}else{
Snake.handler=setInterval(function(){Snake.move();},Snake.speed);
submit.getElementsByTagName("span")[0].innerHTML="暂停:";
submit.getElementsByTagName("input")[0].setAttribute("value","暂停");
}
};
},
count:function(){
var submit=document.getElementById("count").getElementsByTagName("li")[1];
this.score+=1;
submit.getElementsByTagName("span")[0].innerHTML=this.score;
}
}
window.onload=function(){
Map.show();
Snake.init(5);
Snake.handler=setInterval(function(){Snake.move();},Snake.speed);
Food.show();
Install.control();
};
</script>
</head>
<body>
<div id="box">
<div id="count">
<ul>
<li><span>暂停:</span><input type="submit" value="暂停"></li>
<li>得分:<span>0</span></li>
</ul>
</div>
</div>
</body>
</html>