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贪吃蛇.html
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贪吃蛇.html
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<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
*{
margin: 0;
padding: 0;
}
#container{
width: 1000px;
height: 550px;
border: 1px solid #000;
margin: 100px auto;
}
#ground{
width: 1000px;
height: 500px;
position: relative;
}
#button{
float: right;
height: 50px;
line-height: 50px;
}
button{
width: 50px;
height: 20px;
cursor: pointer;
}
.block{
width: 20px;
height: 20px;
background: #2abad9;
float: left;
}
.snakeBody{
width: 20px;
height: 20px;
position: absolute;
background: #f57926;
}
.food{
width: 20px;
height: 20px;
background: green;
position: absolute;
}
</style>
</head>
<body>
<div id="container">
<div id="ground"></div>
<div id="gameControl">
<div id="button">
<button id="start">开始</button>
<button id="pause">暂停</button>
</div>
</div>
</div>
</body>
<script>
var timer;
window.onload=function(){
createGrass();
createSnake();
createFood();
document.getElementById('start').onclick=function(){
clearInterval(timer); //防止多次点击开始
timer=setInterval(function(){
snakeMove(diRection);
},150);
snakeMove(diRection);
};
document.getElementById('pause').onclick=function(){
clearInterval(timer);
};
};
//创建草坪
function createGrass(){
var oGround=document.getElementById('ground');
var oDiv;
for(var i=0;i<50;i++){
for(var j=0;j<25;j++){
oDiv=document.createElement('div');
oDiv.className='block';
oGround.appendChild(oDiv);
}
}
}
//创建蛇
var snakeBody=[],oFood,diRection='left';
function createSnake(){
var oGround=document.getElementById('ground');
var oDiv;
for(var i=0;i<3;i++){
oDiv=document.createElement('div');
oDiv.className='snakeBody';
oDiv.style.left=(i+40)*20+'px';
oDiv.style.top='60px';
oGround.appendChild(oDiv);
snakeBody.push(oDiv);
}
}
//创建食物
function createFood(){
var flag=true; //该标识用于判断生成的div是否和蛇身div重合
var oGround=document.getElementById('ground');
// var oDiv;
var len=snakeBody.length;
var iLeft,iTop;
oFood=document.createElement('div');
oFood.className='food';
iLeft=parseInt(Math.random()*49)*20;
iTop=parseInt(Math.random()*24)*20;
for(var i=0;i<len;i++){
if(snakeBody[i].offsetLeft == iLeft && snakeBody[i].offsetTop == iTop){ //可console.log(snakeBody[i]),其中是按照offsetLeft和offsetTop来确定方块位置的
flag=false;
break;
}
}
if(flag==true){
oFood.style.left=iLeft+'px';
oFood.style.top=iTop+'px';
oGround.appendChild(oFood);
}else{
createFood(); //若生成的div有重合则再次调用自身
}
}
//蛇运动
function snakeMove(direction){ //direction用于作为蛇移动的四个方向的判断
var snakeHead=snakeBody[0]; //获取蛇头
diRection=direction; //用于防止比如蛇身本来往左边走，但是向右按钮仍然有效的情况
for(var i=snakeBody.length-1;i>0;i--){ //移动说白了就是后面的div使用它前一个div的位置
snakeBody[i].style.left=snakeBody[i-1].offsetLeft+'px';
snakeBody[i].style.top=snakeBody[i-1].offsetTop+'px';
}
switch (direction){ //蛇头的位置
case 'left':snakeHead.style.left=snakeHead.offsetLeft-20+'px';break;
case 'right':snakeHead.style.left=snakeHead.offsetLeft+20+'px';break;
case 'up':snakeHead.style.top=snakeHead.offsetTop-20+'px';break;
case 'down':snakeHead.style.top=snakeHead.offsetTop+20+'px';break;
}
//蛇头碰壁
if(snakeHead.offsetLeft == -20 || snakeHead.offsetLeft == 1000 || snakeHead.offsetTop == -20 || snakeHead.offsetTop == 500){
clearInterval(timer);
if(confirm('再来一次?')){
window.location.reload();
}
}
//蛇碰到自身
for(var j=1;j<snakeBody.length;j++){
if(snakeHead.offsetLeft == snakeBody[j].offsetLeft && snakeHead.offsetTop == snakeBody[j].offsetTop){
clearInterval(timer);
if(confirm('再来一次')){
window.location.reload();
}
}
}
//吃掉食物
if(snakeHead.offsetLeft==oFood.offsetLeft && snakeHead.offsetTop==oFood.offsetTop){
oFood.className='snakeBody snake-block'; //食物变成和蛇身一样的颜色
console.log(snakeBody[snakeBody.length-1].offsetTop);
switch (direction){ //把oFood的坐标采用最后一个div的坐标
case 'left':oFood.style.left=snakeBody[snakeBody.length-1].offsetLeft+'px';break;
case 'right':oFood.style.left=snakeBody[snakeBody.length-1].offsetLeft+'px';break;
case 'up':oFood.style.top=snakeBody[snakeBody.length-1].offsetTop+'px';break;
case 'down':oFood.style.top=snakeBody[snakeBody.length-1].offsetTop+'px';break;
}
snakeBody.push(oFood); //这里最好用push把吃掉的div添加到蛇尾,添加到头部有一个问题，吐过实物div是靠边生成，那么吃掉后会超出墙范围或者直接撞墙
createFood();
}
}
//上下左右操作
document.onkeydown=function(e){ //document不要换成window，出滚动条的话，window会导致窗口移动
var event=e || window.event;
var direction=event.keyCode;
switch (direction){
case 37:
if(diRection != 'right'){
snakeMove('left');
}
break; //左
case 39:
if(diRection != 'left'){
snakeMove('right');
}
break; //右
case 38:
if(diRection != 'down'){
snakeMove('up');
}
break; //上
case 40:if(diRection != 'up'){
snakeMove('down');
}
break; //下
}
}
</script>
</html>