JavaScript原生编写《飞机大战坦克》游戏完整实例

先来看看开始的界面图

实现思路:

      1.打开页面,背景开始走动;

      2.点击开始,飞机开始不断发射子弹,敌人随机出现在上方;

      3.当敌人碰到子弹,敌人消失;

      4.当敌人和飞机相遇,飞机死亡,结束游戏;

html页面

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>飞机大战</title>
 <link rel="stylesheet" type="text/css" href="飞机大战.css">
</head>
<body>
 <div id="mainScreen">
<!-- 背景图片 -->
 <div id="bgImg1" class="bg"></div>
 <div id="bgImg2" class="bg"></div>
<!-- 飞机 -->
 <div id="airplane"></div>
<!-- 开始按钮 -->
 <div id="startMenu">
  <a href="#" id="start">Start</a>
 </div>
<!-- 重新开始按钮 -->
 <div id="restartMenu">
  <a href="#" id="restart">Game Over!<br/>重新开始</a>
 </div>
<!-- 敌人 -->
 <div class="enemy"></div>
 <div class="enemy"></div>
 <div class="enemy"></div>
 <div class="enemy"></div>
 <div class="enemy"></div>
<!-- 子弹 -->
 <div class="bullet"></div>
 <div class="bullet"></div>
 <div class="bullet"></div>
 <div class="bullet"></div>
 <div class="bullet"></div>
 <div class="bullet"></div>
 <div class="bullet"></div>
 <div class="bullet"></div>
 <div class="bullet"></div>
 <div class="bullet"></div>
 </div>

 <script type="text/javascript" src="sunckBase.js"></script>
 <script type="text/javascript" src="飞机大战.js"></script>
</body>
</html>

css样式

*{
 margin: 0;
 padding: 0;
 font-family: "微软雅黑";
}
#mainScreen{
 width: 512px;
 height: 768px;
 margin:0 auto;
 position: relative;
 overflow: hidden;
}
.bg{
 width: 512px;
 height:768px;
 position: absolute;
 background: url(bg.jpg);
}
#bgImg2{
 top:-768px;
}

#airplane{
 width: 109px;
 height: 82px;
 position: absolute;
 background: url(hero.png);
 left: 215px;
 top: 668px;
}

.enemy{
 position: absolute;
 width: 30px;
 height: 30px;
 left: -100px;
 top: 0px;

 background: url(enemy.png);
 background-size: 30px 30px;
}

.bullet{
 position: absolute;
 width: 5px;
 height: 10px;
 left: -100px;
 top: -100px;
 background: url(bullet.png);
 background-size: 5px 10px;
}
#startMenu, #restartMenu{
 position: absolute; 
 width: 512px; 
 text-align: center; 
 left: 0; 
 top: 300px;
}
#start, #restart{
 line-height:50px; 
 font-size:30px; 
 font-weight:bold; 
 color:#F00; 
 display:block; 
 text-decoration:none;
}
#restartMenu{
 display: none;
}

进入页面时,背景开始动

//给背景设置定时器,让背景不停的动,形成动感
var bgTimer = setInterval(bgRun, 10);
function bgRun() {
 jsBg1.style.top = jsBg1.offsetTop + 1 + "px";
 jsBg2.style.top = jsBg2.offsetTop + 1 + "px";
 if (jsBg1.offsetTop >= 768) {
 jsBg1.style.top = "-768px";
 } else {
 if (jsBg2.offsetTop >= 768) {
  jsBg2.style.top = "-768px";
 }
 }
}

点击开始,进入游戏


游戏中

注:其实子弹和敌人的标签没有几个,但是我们使用定时器,开始之前,现将表现都放在屏幕外,进入游戏需要时候再改变标签定位,将其放入到页面中。

var jsStartBox=document.getElementById("startMenu")
jsStart.onclick = function startGame(){
 jsStartBox.style.display="none";
 var baseX = 0;
 var baseY = 0;
 var moveX = 0;
 var moveY = 0;
 jsAirplane.onmousedown = function(e) {
 var evt = e || window.event;
 baseX = evt.pageX;
 baseY = evt.pageY;
 jsDivBox.onmousemove = function(v) {
  var vt = v || window.event;
  moveX = vt.pageX - baseX;
  baseX = vt.pageX;
  moveY = vt.pageY - baseY;
  baseY = vt.pageY;
  jsAirplane.style.left = jsAirplane.offsetLeft + moveX + "px";
  jsAirplane.style.top = jsAirplane.offsetTop + moveY + "px";
 };
 };
 jsAirplane.onmouseup = function() {
 mainScreen.onmousemove = null;
 }
 //找到可用的子弹
 var findBulletTimer = setInterval(findBullet, 300);
 function findBullet() {
 for (var i = 0; i < jsBullets.length; i++) {
  if (jsBullets[i]["isShow"] == false) {
  jsBullets[i]["isShow"] = true;
  //将子弹移动到飞机头
  jsBullets[i].style.left = jsAirplane.offsetLeft + jsAirplane.offsetWidth / 2 + "px";
  jsBullets[i].style.top = jsAirplane.offsetTop + "px";
  break;
  }
 }
 }
 // //让子弹飞
 var bulletFlyTimer = setInterval(bulletFlay, 100);
 function bulletFlay() {
 for (var j = 0; j < jsBullets.length; j++) {
  if (jsBullets[j]["isShow"] == true) {
  if (jsBullets[j].offsetTop > -20) {
   jsBullets[j].style.top = jsBullets[j].offsetTop - 20 + "px";
  } else {
   jsBullets[j].style.left = "-100px";
   jsBullets[j].style.top = "-100px";
   jsBullets[j]["isShow"] = false;
  }
  }
 }
 }



 //找到可用敌人
 var findEnemyTimer = setInterval(findEnemy, 500);
 function findEnemy(){
 //找到一个没有在屏幕中的敌人
 for (var i = 0; i < jsEnemys.length; i++) {
  if (jsEnemys[i]["isShow"] == false) {
  //标记敌人已经使用
  jsEnemys[i]["isShow"] = true;
  //将敌人移动到屏幕
  var left = randomNum(0, 482);
  jsEnemys[i].style.left = left + "px";
  jsEnemys[i].style.top = 0 + "px";
  break;
  }
 }
 }
 // //让敌人下落
 var enemyLandTimer = setInterval(enemyLand, 100);
 function enemyLand() {
 for (var j = 0; j < jsEnemys.length; j++) {
  if (jsEnemys[j]["isShow"] == true) {
  var a = randomNum(4, 20);
  if (jsEnemys[j].offsetTop <= 768) {
   jsEnemys[j].style.top = jsEnemys[j].offsetTop + a + "px";
  } else {
   jsEnemys[j].style.left = "-100px";
   jsEnemys[j].style.top = "0px";
   jsEnemys[j]["isShow"] = false;
  }
  }
 }
 } 
}

打中怪物

用页面上存在每一个敌人和每一个子弹的定位进行简则,如果相撞,那么怪物消失

var perishEnemyTimer = setInterval(perishEnemy, 50);
function perishEnemy() {
 for (var i = 0; i < jsBullets.length; i++) {
 if (jsBullets[i]["isShow"] == true) {
  for (var j = 0; j < jsEnemys.length; j++) {
  if (jsEnemys[j]["isShow"] == true) {
   var ret = pzjcFunc(jsBullets[i], jsEnemys[j]);
   if (ret) {
   jsBullets[i].style.left = "-100px";
   jsBullets[i].style.top = "-100px";
   jsBullets[i]["isShow"] = false;

   jsEnemys[j].style.left = "-100px";
   jsEnemys[j].style.top = "-100px";
   jsEnemys[j]["isShow"] = false;
   }
  }
  }
 }
 }
}

死亡检测


游戏结束

用页面上存在每一个敌人和飞机的定位进行检测,如果两者相遇,那么结束游戏。

注:检测时考虑取反,坦克在飞机上面,在飞机下面,在飞机左边,在飞机右边是没有碰到的时候,那么我们取反就是说明两者已经相遇了。

//死亡检测
var dieTimer = setInterval(die, 50);
var jsStop = document.getElementById("restartMenu")
function die() {
 for (var i = 0; i < jsEnemys.length; i++) {
 if (jsEnemys[i]["isShow"] == true) {
  var isDie = pzjcFunc(jsAirplane, jsEnemys[i]);
  if (isDie) {
  jsStop.style.display="block";
  jsAirplane.onmouseup = function() {
   mainScreen.onmousemove = null;
  }
  }
 }
 }
}

上述两步中用到的检测两者是否碰撞的函数

//死亡检测的函数
function pzjcFunc(obj1, obj2){
 var obj1Left = obj1.offsetLeft;
 var obj1Width = obj1Left + obj1.offsetWidth;
 var obj1Top = obj1.offsetTop;
 var obj1Height = obj1Top + obj1.offsetHeight;

 var obj2Left = obj2.offsetLeft;
 var obj2Width = obj2Left + obj2.offsetWidth;
 var obj2Top = obj2.offsetTop;
 var obj2Height = obj2Top + obj2.offsetHeight;

 if ( !(obj1Left > obj2Width || obj1Width < obj2Left || obj1Top > obj2Height || obj1Height < obj2Top) ) {
 return true;
 } 
 return false;
}

点击重新开始之后刷新页面

var jsRestart=document.getElementById("restart");
jsRestart.onclick=function(){
 jsStop.style.display="none";
 window.location.reload();//刷新页面
}

好的,现在我们的游戏就可以玩了,这个游戏的有些写作思想有些是我们在以后的项目中可以学习的。比如,页面之外的空间的运用;比如,检测碰撞。

总结

以上就是这篇文章的全部内容了,希望本文的内容对大家学习或者使用Javascript能带来一定的帮助,如果有疑问大家可以留言交流。

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