Of Stack

JS Realizes Simple Snake Game

  • 2021-08-06 20:56:16
  • OfStack

This article example for everyone to share JS implementation of simple snake specific code, for your reference, the specific content is as follows 


<!DOCTYPE html>
<html>
<head>
 <title></title>
 <meta charset="utf-8">
 <style type="text/css">
 #body{
  width: 900px;/*长宽最好是obj的倍数*/
  height: 600px;
  border-width: 10px;
  border-style: solid;
  border-color: blue;
  line-height:600px;/*文本垂直居中*/
  text-align: center;/*文本水平居中*/
  position: relative;/*相对定位*/
  left: 0px;
  top: 0px;
 }
 #obj{
  width: 30px;
  height: 30px;
  background-color: red;
  position: absolute;/*绝对定位*/
  left: 0px;
  top: 0px;
  z-index: 1;/*头部在上层显示*/
 }
 div{
  text-align: center;
  line-height:30px;
 }
 </style>
</head>
 
<body id='body'>
 <!--内容-->
 按awsd移动
 <div id='obj'></div>
 <select id='speed' onclick="setspeed(this)">
 <option value="100">快速</option>
 <option value="500">中速</option>
 <option value="1000" selected>慢速</option>
 </select>
 | <button onclick="lenbodyadd()">身体+1</button>
 | <button onclick="stopspeed()">暂停</button>
 <div class="div"></div>
</body>
</html>
<script>
 
 var val={key:"d"};//默认向右移动
 var key = document.getElementById("body");
 key.onkeydown =f; //注册keydown事件处理函数
 var divnum=1;//身体每节编号
 var lenbody=5;//默认身体长度
 var speed=1000;//默认速度
 
 var obj=document.getElementById('obj');
 var myWidth=parseInt(getComputedStyle(obj,null).getPropertyValue('width'));
 var myHeight=parseInt(getComputedStyle(obj,null).getPropertyValue('height'));
 
 var clientH= document.body.clientHeight;//获取body高
 var clientW= document.body.clientWidth;//获取body宽
 
 var foodLeft=0;//食物x坐标
 var foodTop=0;//食物y坐标
 
 function f (va) {
 var e = e || window.event; //标准化事件处理
 let s = '';//val.type + " " + val.key; //获取键盘事件类型和按下的值
 let key=val.key;
 val=va;
 
 var myTop=parseInt(getComputedStyle(obj,null).getPropertyValue('top'));//获取精灵y坐标 parseInt(obj.style.top);
 var myLeft=parseInt(getComputedStyle(obj,null).getPropertyValue('left'));//获取精灵x坐标 parseInt(obj.style.left);
 
 var movePx=myWidth;//每次移动的距离
 var move=0;
 if(key=='w'){
  move=myTop-movePx;//每次移动10
  if(move<0 || move>clientH){
  return false;//不能超过边界
  }
  obj.style.top=move+'px';
  s='上';
 }
 if(key=='s'){
  move=myTop+movePx;
  if(move<0 || move>clientH-myHeight){
  return false;
  }
  obj.style.top=move+'px';
  s='下';
 }
 if(key=='a'){
  move=myLeft-movePx;
  if(move<0 || move>clientW){
  return false;
  }
  obj.style.left=move+'px';
  s='左';
 }
 if(key=='d'){
  move=myLeft+movePx;
  if(move<0 || move>clientW-myWidth){
  return false;
  }
  obj.style.left=move+'px';
  s='右';
 }
 obj.innerText=s;//设置文本 & 清楚之前的元素
 console.log(move+' top:'+myTop+' left:'+myLeft);
 
 //移除之前的身体元素，使有头有尾
 if(document.getElementsByClassName('div').length>=lenbody){
  document.getElementsByClassName('div')[0].parentNode.removeChild(document.getElementsByClassName('div')[0]);
 }
 
 //div身体元素随后移动
 let newMyMoveWidth=myLeft;
 let newMyMoveHeight=myTop;
 
 let div=document.createElement('div');
  div.className ='div';
  div.style.width = myWidth + 'px';
  div.style.height = myHeight + 'px';
  div.style.position = 'absolute';
  div.style.left=newMyMoveWidth + 'px';
  div.style.top=newMyMoveHeight + 'px';
  div.style.backgroundColor='blue';
  div.innerHTML=divnum;//设置文字|方便识别div顺序
 obj.parentNode.appendChild(div);
 console.log('newMyMoveWidth:'+newMyMoveWidth+' newMyMoveHeight:'+newMyMoveHeight);
 divnum++;
 
 ifeatfood(myLeft,myTop);
 } /*f() end--*/
 
 
 //生成食物
 function setfood(){
 
 foodLeft=parseInt(Math.random()*clientW);
 foodTop=parseInt(Math.random()*clientH);
 
 let div=document.createElement('div');
  div.id ='food';
  div.style.width = myWidth + 'px';
  div.style.height = myHeight + 'px';
  div.style.position = 'absolute';
  div.style.left= foodLeft + 'px';
  div.style.top= foodTop + 'px';
  div.style.backgroundColor='pink';
  div.innerHTML='吃';//设置文字|方便识别div顺序
 document.body.appendChild(div);
 }
 setfood();
 
 //判断吃到食物
 function ifeatfood(myLeft,myTop){
 //判断是否吃到食物
 if(Math.abs(foodLeft-myLeft)<myWidth && Math.abs(foodTop-myTop)<myHeight){
  lenbodyadd();//长度+1
  //删除旧food，生成新food
  document.getElementById('food').parentNode.removeChild(document.getElementById('food'));
  setfood();
 }
 }
 
 //吃到食物身体加1
 function lenbodyadd(){
 lenbody++;
 }
 
 //保持移动
 var setinter=setInterval((function move(){
 f(val);
 }),speed);
 
 //设置移动速度
 function setspeed(obj){
 speed=obj.options[obj.options.selectedIndex].value;
 stopspeed();
 setinter=setInterval((function move(){
  f(val);
 }),speed);
 }
 
 //停止移动
 function stopspeed(){
 clearInterval(setinter);
 }
 
 //窗口改变时跳转-防f12
 window.onresize = ()=>{
 console.log(window.innerWidth,window.innerHeight);
 //window.location.href='https://www.baidu.com';
 }
</script>

More interesting classic game implementation topics, share with you:

C + + Classic Games Summary

python Classic Games Summary

python Tetris Game Collection

JavaScript classic games can't stop playing

java Classic Games Summary

javascript Classic Games Summary

Related articles: