var scores=;
/*
 创建飞机类
 */
function plan(hp,X,Y,sizeX,sizeY,score,dietime,sudu,boomimage,imagesrc){
 this.planX=X;
 this.planY=Y;
 this.imagenode=null;
 this.planhp=hp;
 this.planscore=score;
 this.plansizeX=sizeX;
 this.plansizeY=sizeY;
 this.planboomimage=boomimage;
 this.planisdie=false;
 this.plandietimes=;
 this.plandietime=dietime;
 this.plansudu=sudu;

//行为

/*
移动行为
 */
 this.planmove=function(){
 if(scores<=){
 this.imagenode.style.top=this.imagenode.offsetTop+this.plansudu+"px";
 }
 else if(scores>&&scores<=){
 this.imagenode.style.top=this.imagenode.offsetTop+this.plansudu++"px";
 }
 else if(scores>&&scores<=){
 this.imagenode.style.top=this.imagenode.offsetTop+this.plansudu++"px";
 }
 else if(scores>&&scores<=){
 this.imagenode.style.top=this.imagenode.offsetTop+this.plansudu++"px";
 }
 else if(scores>&&scores<=){
 this.imagenode.style.top=this.imagenode.offsetTop+this.plansudu++"px";
 }
 else{
 this.imagenode.style.top=this.imagenode.offsetTop+this.plansudu++"px";
 }
 }
 this.init=function(){
 this.imagenode=document.Element("img");
 this.imagenode.style.left=this.planX+"px";
 this.imagenode.style.top=this.planY+"px";
 this.imagenode.src=imagesrc;
 mainDiv.appendChild(this.imagenode);
 }
 this.init();
}
/*
创建子弹类
 */
function bullet(X,Y,sizeX,sizeY,imagesrc){
 this.bulletX=X;
 this.bulletY=Y;
 this.bulletimage=null;
 this.bulletattach=;
 this.bulletsizeX=sizeX;
 this.bulletsizeY=sizeY;


//行为
/*
 移动行为
 */
 this.bulletmove=function(){
 this.bulletimage.style.top=this.bulletimage.offsetTop-+"px";
 }
 this.init=function(){
 this.bulletimage=document.Element("img");
 this.bulletimage.style.left= this.bulletX+"px";
 this.bulletimage.style.top= this.bulletY+"px";
 this.bulletimage.src=imagesrc;
 mainDiv.appendChild(this.bulletimage);
 }
 this.init();
}
/*
 创建单行子弹类
 */
function oddbullet(X,Y){
 bullet.call(this,X,Y,,,"image/bullet.png");
}


/*
创建敌机类
 */


function enemy(hp,a,b,sizeX,sizeY,score,dietime,sudu,boomimage,imagesrc){
 plan.call(this,hp,random(a,b),-,sizeX,sizeY,score,dietime,sudu,boomimage,imagesrc);
}


//产生min到max之间的随机数


function random(min,max){
 return Math.floor(min+Math.random()*(max-min));
}


/*
创建本方飞机类
 */


function ourplan(X,Y){
 var imagesrc="/UploadFiles/2021-04-02/我的飞机.gif">

//暂停界面重新开始事件


//function chongxinkaishi(){
// location.reload(true);
// startdiv.style.display="none";
// maindiv.style.display="block";
//}

var bodyobj=document.getElementsByTagName("body")[];
if(document.addEventListener){
 //为本方飞机添加移动和暂停
 mainDiv.addEventListener("mousemove",yidong,true);
 //为本方飞机添加暂停事件
 selfplan.imagenode.addEventListener("click",zanting,true);
 //为body添加判断本方飞机移出边界事件
 bodyobj.addEventListener("mousemove",bianjie,true);
 //为暂停界面的继续按钮添加暂停事件
 suspenddiv.getElementsByTagName("button")[].addEventListener("click",zanting,true);
// suspenddiv.getElementsByTagName("button")[].addEventListener("click",chongxinkaishi,true);
 //为暂停界面的返回主页按钮添加事件
 suspenddiv.getElementsByTagName("button")[].addEventListener("click",jixu,true);
}
else if(document.attachEvent){
 //为本方飞机添加移动
 mainDiv.attachEvent("onmousemove",yidong);
 //为本方飞机添加暂停事件
 selfplan.imagenode.attachEvent("onclick",zanting);
  //为body添加判断本方飞机移出边界事件
 bodyobj.attachEvent("onmousemove",bianjie);
 //为暂停界面的继续按钮添加暂停事件
 suspenddiv.getElementsByTagName("button")[].attachEvent("onclick",zanting);
// suspenddiv.getElementsByTagName("button")[].attachEvent("click",chongxinkaishi,true);
 //为暂停界面的返回主页按钮添加事件
 suspenddiv.getElementsByTagName("button")[].attachEvent("click",jixu,true);
}
//初始化隐藏本方飞机
selfplan.imagenode.style.display="none";
/*
敌机对象数组
 */
var enemys=[];
/*
子弹对象数组
 */
var bullets=[];
var mark=;
var mark=;
var backgroundPositionY=;
/*
开始函数
 */
function start(){
 mainDiv.style.backgroundPositionY=backgroundPositionY+"px";
 backgroundPositionY+=.;
 if(backgroundPositionY==){
 backgroundPositionY=;
 }
 mark++;
 /*
 创建敌方飞机
 */
 if(mark==){
 mark++;
  //中飞机
 if(mark%==){
 enemys.push(new enemy(,,,,,,,random(,),"image/中飞机爆炸.gif","image/enemy_fly_.png"));
 }
  //大飞机
 if(mark==){
 enemys.push(new enemy(,,,,,,,,"image/大飞机爆炸.gif","image/enemy_fly_.png"));
 mark=;
 }
 //小飞机
 else{
 enemys.push(new enemy(,,,,,,,random(,),"image/小飞机爆炸.gif","image/enemy_fly_.png"));
 }
 mark=;
 }
/*
移动敌方飞机
 */
 var enemyslen=enemys.length;
 for(var i=;i<enemyslen;i++){
 if(enemys[i].planisdie!=true){
 enemys[i].planmove();
 }
/*
 如果敌机超出边界,删除敌机
 */
 if(enemys[i].imagenode.offsetTop>){
 mainDiv.removeChild(enemys[i].imagenode);
 enemys.splice(i,);
 enemyslen--;
 }
 //当敌机死亡标记为true时，经过一段时间后清除敌机
 if(enemys[i].planisdie==true){
 enemys[i].plandietimes+=;
 if(enemys[i].plandietimes==enemys[i].plandietime){
 mainDiv.removeChild(enemys[i].imagenode);
 enemys.splice(i,);
 enemyslen--;
 }
 }
 }
/*
创建子弹
*/
 if(mark%==){
 bullets.push(new oddbullet(parseInt(selfplan.imagenode.style.left)+,parseInt(selfplan.imagenode.style.top)-));
 }
/*
移动子弹
*/
 var bulletslen=bullets.length;
 for(var i=;i<bulletslen;i++){
 bullets[i].bulletmove();
/*
如果子弹超出边界,删除子弹
*/
 if(bullets[i].bulletimage.offsetTop<){
 mainDiv.removeChild(bullets[i].bulletimage);
 bullets.splice(i,);
 bulletslen--;
 }
 }
/*
碰撞判断
*/
 for(var k=;k<bulletslen;k++){
 for(var j=;j<enemyslen;j++){
 //判断碰撞本方飞机
 if(enemys[j].planisdie==false){
 if(enemys[j].imagenode.offsetLeft+enemys[j].plansizeX>=selfplan.imagenode.offsetLeft&&enemys[j].imagenode.offsetLeft<=selfplan.imagenode.offsetLeft+selfplan.plansizeX){
  if(enemys[j].imagenode.offsetTop+enemys[j].plansizeY>=selfplan.imagenode.offsetTop+&&enemys[j].imagenode.offsetTop<=selfplan.imagenode.offsetTop-+selfplan.plansizeY){
  //碰撞本方飞机，游戏结束，统计分数
  selfplan.imagenode.src="/UploadFiles/2021-04-02/本方飞机爆炸.gif">

以上代码简单吧，使用纯javascript模仿微信打飞机小游戏，当时方法还有很多种，欢迎大家一起来分享。