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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></div>
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;
}
</div>
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";
}
}
}
</div>
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;
}
}
}
}
}
</div>
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;
}
}
}
}
}
}
</div>
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