本文實例為大家分享了js貪吃蛇小游戲demo，純js和css完成，供大家參考，具體內容如下
<!doctype html>
<html>
<meta charset="utf-8">
<head>
<style>
*{
margin: 0;
padding:0;
}
.content{
position: absolute;
width: 500px;
height: 500px;
background-color: #212121;
}
.colo{
width: 48px;
height: 48px;
background-color: #E6E6E6;
border: 1px solid #466F85;
float: left;
}
.head{
/*background-color: #49DF85;*/
background-image: url(./img/22.jpg);
border-radius: 10px;
background-size: 100%;
position: absolute;
height: 48px;
width: 48px;
}
.fruit{
/*background-color: #49DF85;*/
background-image: url(./img/fruit.jpg);
background-size: 100%;
position: absolute;
height: 48px;
width: 48px;
}
.score{
font-family: '黑體';
left:600px;
position: absolute;
height: 50px;
width: 200px;
background-color: #212121;
color: #FFF;
}
.newbody{
position: absolute;
width: 48px;
height: 48px;
background-image: url(./img/33.jpg);
background-size: 100%;
}
.btn{
font-family: '黑體';
left:600px;
top: 100px;
position: absolute;
height: 50px;
width: 100px;
background-color: #1193FF;
color: #FFF;
text-align: center;
line-height: 50px;
font-size: 20px;
cursor: pointer;
border-radius: 15px;
}
</style>
</head>
<body>
<div class="content" id="content">
</div>
<div class="btn" id="stop">停止游戲</div>
<div class="btn" style="top:180px" id="start">開啟游戲</div>
<div class="btn" style="top:380px" id="gameWay">游戲狀態：</div>
<div class="score" id="score" >分數：<p></p></div>
<script type="text/javascript" >
//添加狀態
var stop=document.getElementById('stop');
var start=document.getElementById("start");
var gameWay=document.getElementById('gameWay');
start.onclick=function(){
head.value='2';
incident=setInterval(move,200);
}
stop.onclick=function(){
clearInterval(incident);
}
//
var content=document.getElementById("content");
for(var i=0;i<100;i++){
var div=document.createElement("div");
div.className="colo";
content.appendChild(div);
}
var scoreId=document.getElementById("score");
var scoreNum=0;
var scoreCon=document.createElement("p");
// var scoreText=document.createTextNode(scoreNum);
// scoreCon.appendChild(scoreText);
scoreId.appendChild(scoreCon);
var head=null; //保存蛇頭
var fruit=null; //保存果實
var dir=null; //保存蛇的方向
var body=new Array(); //保存蛇身體增加的部分
var bodyNum=0; //記錄創建了多少個body
//隨機創建head和fruit到content裡面
function createType(type){
if(type==1){
//創建隨機數
var row = parseInt(Math.random() * 6 +2);
var col = parseInt(Math.random() * 6 +2);
head=document.createElement("div");
head.className="head";
head.style.top=row*50+"px";
head.style.left=col*50+"px";
content.appendChild(head);
// head.style.top=;
// head.style.left=;
}
if(type==2){
//創建隨機數
var row = parseInt(Math.random() * 6 +2);
var col = parseInt(Math.random() * 6 +2);
fruit=document.createElement("div");
fruit.className="fruit";
fruit.style.width="50";
fruit.style.height="50";
fruit.style.backgroundColor="#EA2000";
fruit.style.top=row*50+"px";
fruit.style.left=col*50+"px";
content.appendChild(fruit);
}
}
//調用創建的道具方法
createType(1);
createType(2);
//蛇頭移動函數
var direction=new Array; //存每個新建Body的方向
//轉換數
var numss=0;
//自動滑動事件
function move(){
if(head.value!=""){
switch(head.value){
case '1':
head.style.top=head.offsetTop-50+"px";
break;
case '2':
head.style.top=head.offsetTop+50+"px";
break;
case '3':
head.style.left=head.offsetLeft-50+"px";
break;
case '4':
head.style.left=head.offsetLeft+50+"px";
break;
}
}
console.log(head.offsetTop);
if(head.offsetTop>500){
alert("超出邊界！請重新游戲");
}
// if(head==null){
// if(head.style.top<0||head.style.top>500||head.style.left<0||head.style.left>500){
// alert("超出邊界！請重新游戲");
// }
if(body.length!=0){
for(var i=body.length-1;i>=0;i--){
if(i==0){
body[0].value=head.value;
}else{
body[i].value=body[i-1].value;
}
}
}
//轉換方向
//如果成功吃掉果實後事件
if(head.style.top==fruit.style.top&&head.style.left==fruit.style.left){
var row = parseInt(Math.random() * 6 +2);
var col = parseInt(Math.random() * 6 +2);
fruit.style.top=row*50+"px";
fruit.style.left=col*50+"px";
//記錄分數
scoreNum=scoreNum+1;
document.getElementsByTagName('p')[0].innerText="";
document.getElementsByTagName('p')[0].innerText=scoreNum;
//創建body部分
bodyAdd(head.style.top,head.style.left,head.value);
}
//控制body跟隨head運動部分
//有身體的時候要動態改變body的值
if(body.length>0){
var body01=document.getElementById('body01');
body01.style.top=head.offsetTop+"px";
body01.style.left=head.offsetLeft+"px";
switch(head.value){
case '1':
body01.style.top=head.offsetTop+50+"px";
body01.style.left=head.offsetLeft+"px";
break;
case '2':
body01.style.top=head.offsetTop-50+"px";
body01.style.left=head.offsetLeft+"px";
break;
case '3':
body01.style.left=head.offsetLeft+50+"px";
body01.style.top=head.offsetTop+"px";
break;
case '4':
body01.style.left=head.offsetLeft-50+"px";
body01.style.top=head.offsetTop+"px";
break;
}
}
if(body.length>1){
body[bodyNum-1].value=body[bodyNum-2].value;
for(var i=1;i<body.length;i++){
var nu=i+1;
var bodyId=document.getElementById('body0'+nu);
var body_Id=document.getElementById('body0'+i);
bodyId.style.top=body_Id.offsetTop+"px";
bodyId.style.left=body_Id.offsetLeft+"px";
switch(body[bodyNum-(body.length-i)].value){
case '1':
bodyId.style.top=body_Id.offsetTop+50+"px";
bodyId.style.left=body_Id.offsetLeft+"px";
break;
case '2':
bodyId.style.top=body_Id.offsetTop-50+"px";
bodyId.style.left=body_Id.offsetLeft+"px";
break;
case '3':
bodyId.style.left=body_Id.offsetLeft+50+"px";
bodyId.style.top=body_Id.offsetTop+"px";
break;
case '4':
bodyId.style.left=body_Id.offsetLeft-50+"px";
bodyId.style.top=body_Id.offsetTop+"px";
break;
}
}
}
}
//創建按鈕時間
document.onkeydown=function(){
var code=event.keyCode;
switch (code){
//向上
case 38:
head.value='1';
break;
//向下
case 40:
head.value='2';
break;
//向左
case 37:
head.value='3';
break;
//向右
case 39:
head.value='4';
break;
console.log(head.value);
}
}
//身體增加事件
function bodyAdd(top,left,dir){
if(dir!=""){
dir=dir;
}
else{
dir=head.value;
}
//首次創建body
if(bodyNum==0){
var newbody=document.createElement('div');
newbody.className="newbody";
newbody.id="body01";
switch (dir){
case '1':
newbody.style.top=head.offsetTop-50+'px';
newbody.style.left=head.offsetLeft+"px";
break;
case '2':
newbody.style.top=head.offsetTop+50+'px';
newbody.style.left=head.offsetLeft+"px";
break;
case '3':
newbody.style.left=head.offsetLeft-50+'px';
newbody.style.top=head.offsetTop+"px";
break;
case '4':
newbody.style.left=head.offsetLeft+50+'px';
newbody.style.top=head.offsetTop+"px";
break;
}
content.appendChild(newbody);
bodyNum=bodyNum+1;
body.push(newbody);
}else{
//第二次及多次創建
var newbody=document.createElement('div');
newbody.className="newbody";
newbody.id="body0"+(body.length+1);
switch (dir){
case '1':
newbody.style.top=body[body.length-1].offsetTop-50+'px';
newbody.style.left=body[body.length-1].offsetLeft+"px";
break;
case '2':
newbody.style.top=body[body.length-1].offsetTop+50+'px';
newbody.style.left=body[body.length-1].offsetLeft+"px";
break;
case '3':
newbody.style.left=body[body.length-1].offsetLeft-50+'px';
newbody.style.top=body[body.length-1].offsetTop+"px";
break;
case '4':
newbody.style.left=body[body.length-1].offsetLeft+50+'px';
newbody.style.top=body[body.length-1].offsetTop+"px";
break;
}
content.appendChild(newbody);
bodyNum=bodyNum+1;
body.push(newbody);
}
// body.push(content);
}
//超出邊界，重置信息事件
function initialize(){
//重置果實
var row = parseInt(Math.random() * 6 +2);
var col = parseInt(Math.random() * 6 +2);
fruit.style.top=row*50+"px";
fruit.style.left=col*50+"px";
//記錄分數
document.getElementsByTagName('p')[0].innerText="";
//重置貪食蛇
}
var incident;
incident=setInterval(move,200);
//附加操作
// var btn=document.getElementById('btn');
// btn.onclick=function(){
// clearInterval(incident);
// }
//
</script>
</body>
</html>
還在不斷完善中，希望對大家的學習有所幫助。
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持。