实现代码

Html

<div id="contentdiv">
    <div id="startdiv">
        <button onclick="begin()">开始游戏</button>
    </div>
    <div id="maindiv">
        <div id="scorediv">
            <label>分数：</label>
            <label id="label">0</label>
        </div>
        <div id="suspenddiv">
            <button>继续<;/button><br/>
            <button>重新开始<;/button><br/>
            <button>回到主页</button>
        </div>
        <div id="enddiv">
            <p class="plantext">飞机大战分数</p>
            <p id="planscore">0</p>
            <div><button onclick="jixu()">继续<;/button></div>
        </div>
    </div>
</div>

Css

*{
    margin: 0;
    padding: 0;
}
#contentdiv{
    position: absolute;
    left: 500px;
}
#startdiv{
    width: 320px;
    height: 568px;
    background-image: url(../image/开始背景.png);
}
button{
    outline: none;
}
#startdiv button{
    position: absolute;
    top: 500px;
    left: 82px;
    width: 150px;
    height: 30px;
    border: 1px solid black;
    border-radius: 30px;
    background-color: #c4c9ca;
}
#maindiv{
    width: 320px;
    height: 568px;
    background-image:url(../image/background_1.png) ;
    display: none;
}
#maindiv img{
    position: absolute;
    z-index: 1;
}
#scorediv{
    font-size: 16px;
    font-weight: bold;
    position: absolute;
    top: 10px;
    left: 10px;
    display: none;
}
#scorediv{
    font-size: 18px;
    font-weight: bold;
}
#suspenddiv{
    position: absolute;
    top: 210px;
    left: 82px;
    display: none;
    z-index: 2;
}
#suspenddiv button{
    width: 150px;
    height: 30px;
    margin-bottom: 20px;
    border: 1px solid black;
    border-radius: 30px;
    background-color: #c4c9ca;
}
#enddiv{
    position: absolute;
    top: 210px;
    left: 75px;
    border: 1px solid gray;
    border-radius: 5px;
    text-align: center;
    background-color:#d7ddde;
    display: none;
    z-index: 2;
}
.plantext{
    width: 160px;
    height: 30px;
    line-height: 30px;
    font-size: 16px;
    font-weight: bold;
}
#planscore{
    width: 160px;
    height: 80px;
    line-height: 80px;
    border-top: 1px solid gray;
    border-bottom: 1px solid gray;
    font-size: 16px;
    font-weight: bold;
}
#enddiv div{
    width: 160px;
    height: 50px;
}
#enddiv div button{
    margin-top:10px ;
    width: 90px;
    height: 30px;
    border: 1px solid gray;
    border-radius: 30px;
}

Js

    //获得主界面
var mainDiv=document.getElementById("maindiv");
    //获得开始界面
var startdiv=document.getElementById("startdiv");
    //获得游戏中分数显示界面
var scorediv=document.getElementById("scorediv");
    //获得分数界面
var scorelabel=document.getElementById("label");
    //获得暂停界面
var suspenddiv=document.getElementById("suspenddiv");
    //获得游戏结束界面
var enddiv=document.getElementById("enddiv");
    //获得游戏结束后分数统计界面
var planscore=document.getElementById("planscore");
    //初始化分数
var scores=0;

/*
 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=0;
    this.plandietime=dietime;
    this.plansudu=sudu;
//行为
/*
移动行为
     */
    this.planmove=function(){
        if(scores<=50000){
            this.imagenode.style.top=this.imagenode.offsetTop+this.plansudu+"px";
        }
        else if(scores>50000&&scores<=100000){
            this.imagenode.style.top=this.imagenode.offsetTop+this.plansudu+1+"px";
        }
        else if(scores>100000&&scores<=150000){
            this.imagenode.style.top=this.imagenode.offsetTop+this.plansudu+2+"px";
        }
        else if(scores>150000&&scores<=200000){
            this.imagenode.style.top=this.imagenode.offsetTop+this.plansudu+3+"px";
        }
        else if(scores>200000&&scores<=300000){
            this.imagenode.style.top=this.imagenode.offsetTop+this.plansudu+4+"px";
        }
        else{
            this.imagenode.style.top=this.imagenode.offsetTop+this.plansudu+5+"px";
        }
    }
    this.init=function(){
        this.imagenode=document.createElement("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=1;
    this.bulletsizeX=sizeX;
    this.bulletsizeY=sizeY;
//行为
/*
 移动行为
 */
    this.bulletmove=function(){
        this.bulletimage.style.top=this.bulletimage.offsetTop-20+"px";
    }
    this.init=function(){
        this.bulletimage=document.createElement("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,6,14,"image/bullet1.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),-100,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="image/我的飞机.gif";
    plan.call(this,1,X,Y,66,80,0,660,0,"image/本方飞机爆炸.gif",imagesrc);
    this.imagenode.setAttribute('id','ourplan');
}

/*
 创建本方飞机
 */
var selfplan=new ourplan(120,485);
//移动事件
var ourPlan=document.getElementById('ourplan');
var yidong=function(){
    var oevent=window.event||arguments[0];
    var chufa=oevent.srcElement||oevent.target;
    var selfplanX=oevent.clientX-500;
    var selfplanY=oevent.clientY;
    ourPlan.style.left=selfplanX-selfplan.plansizeX/2+"px";
    ourPlan.style.top=selfplanY-selfplan.plansizeY/2+"px";
//    document.getElementsByTagName('img')[0].style.left=selfplanX-selfplan.plansizeX/2+"px";
//    document.getElementsByTagName('img')[0]..style.top=selfplanY-selfplan.plansizeY/2+"px";
}
/*
暂停事件
 */
var number=0;
var zanting=function(){
    if(number==0){
        suspenddiv.style.display="block";
        if(document.removeEventListener){
            mainDiv.removeEventListener("mousemove",yidong,true);
            bodyobj.removeEventListener("mousemove",bianjie,true);
        }
        else if(document.detachEvent){
            mainDiv.detachEvent("onmousemove",yidong);
            bodyobj.detachEvent("onmousemove",bianjie);
        }
        clearInterval(set);
        number=1;
    }
    else{
        suspenddiv.style.display="none";
        if(document.addEventListener){
            mainDiv.addEventListener("mousemove",yidong,true);
            bodyobj.addEventListener("mousemove",bianjie,

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