JavaScript—飞机大战2版
前面的思路对了 BUG 出在了计时器和没有加判断页面是否存在元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
* {
margin: 0;
padding: 0;
}
#view {
margin: 0 auto;
width: 400px;
height: 680px;
background-color: #00b4ff;
opacity: 0.9;
position: relative;
}
/*自己飞机的样式*/
#air {
width: 34px;
height: 26px;
position: absolute;
background-color: palegreen;
}
/*敌机的样式*/
.hair {
width: 34px;
height: 26px;
position: absolute;
background-color: darkmagenta;
}
/*子弹的样式*/
.bullet {
width: 4px;
height: 10px;
position: absolute;
background-color: red;
}
h1{
position: absolute;
top: 300px;
left: 700px;
}
</style>
</head>
<body>
<div id="view">
</div>
<h1 id="h1">0</h1>
</body>
<script>
//获取区域
let view = document.getElementById('view');
// 创建自己的飞机
let air = document.createElement('div');
let count=0
let h1=document.getElementById('h1')
air.id = 'air'
document.body.appendChild(air)
document.onmousemove = function (e) {
e = e || window.event
// 边距
let aX = view.offsetLeft < e.clientX - air.offsetWidth / 2 && e.clientX + air.offsetWidth / 2 < view.offsetLeft + view.offsetWidth
let aY = view.offsetTop < e.clientY - air.offsetHeight / 2 && e.clientY + air.offsetHeight / 2 < view.offsetTop + view.offsetHeight
if (aX && aY) {
air.style.left = e.clientX - air.offsetWidth / 2 + 'px';
air.style.top = e.clientY - air.offsetHeight / 2 + 'px'
ObJ_billet.bif = true
}
}
//监听飞机子弹
let GAME_time = setInterval(function () {
//搜索所有的子弹，相遇 就被击毙。相遇条件 飞机左<=left 子弹<=you top 子弹<=飞机
for (let i = 0; i < ObJ_billet.arr.length; i++) {
let barr = ObJ_billet.arr[i].split('|')
for (let j = 0; j < ObJ_Hair.arr.length; j++) {
let harr = ObJ_Hair.arr[j].split('|')//id x y
if (document.getElementById(barr[0]) && document.getElementById(harr[0])) {
console.log(1)
let yif = parseInt(barr[2])+3 <= parseInt(harr[2]) //Y相遇
let xif = parseInt(barr[1]) >= parseInt(harr[1]) && parseInt(barr[1]) <= parseInt(harr[1]) + 25
if (yif && xif) {
count++;
h1.innerText=count+''
//消失元素 关闭记时器
let billet_a = document.getElementById(barr[0])
let hair_a = document.getElementById(harr[0])//获取敌机
billet_a.parentNode.removeChild(billet_a)//删除子弹
hair_a.parentNode.removeChild(hair_a)//删除敌机
// clearInterval(runBl_time)
//clearInterval(runHair_time)
}
}
}
}
},100)
let caerBl_time = setInterval(
function () {
if (ObJ_billet.bif) {
//在自己飞机的上方
caeationBillet()
caeationHair()
}
}, 1000)
//用来保存子弹数据
let ObJ_billet = {
name: 'billet_',
num: 0,
bif: false,
//是否在区域
arr: []//保存id，xy坐标
}
let ObJ_Hair = {
name: 'hair_',
num: 0,
arr: []//保存id，xy坐标
}
// let runBl_time = null;//子弹定时器
// let runHair_time = null;//飞机定时器
// // 子弹运动
function run_Billet(element, i) {
let runBl_time = setInterval(function () {
element.style.top = element.offsetTop - 1 + 'px'
ObJ_billet.arr[i] = element.id + '|' + element.offsetLeft + '|' + element.offsetTop
// 超出边界消失
if (element.offsetTop < 0) {
element.parentNode.removeChild(element);
clearInterval(runBl_time)
}
}, 30)
}
// 敌机运动
function run_Hair(element, i) {
let runHair_time = setInterval(function () {
element.style.top = element.offsetTop + 1 + 'px'
ObJ_Hair.arr[i] = element.id + '|' + element.offsetLeft + '|' + element.offsetTop + '|' + ''
// 超出边界消失
if (element.offsetTop > view.offsetHeight - element.offsetHeight) {
element.parentNode.removeChild(element);
clearInterval(runHair_time)
}
}, 30)
}
//创建子弹
function caeationBillet() {
let billet = document.createElement('div')
billet.className = 'bullet'
billet.id = ObJ_billet.name + ObJ_billet.num;
document.body.appendChild(billet)
//子弹在飞机上方
billet.style.left = air.offsetLeft + air.offsetWidth / 2 + 'px'
billet.style.top = air.offsetTop - billet.offsetHeight - 1 + 'px'
//保存数据
ObJ_billet.arr[ObJ_billet.num] = billet.id + '|' + billet.offsetLeft + '|' + billet.offsetTop + '|' + '1'
//子弹运动
run_Billet(billet, ObJ_billet.num)
// 自增1
ObJ_billet.num += 1
//挡子弹有最多50个
if (ObJ_billet.num >= 50) {
ObJ_billet.num = 0;
}
}
// 创建敌机
function caeationHair() {
let hair = document.createElement('div')
hair.className = 'hair'
hair.id = ObJ_Hair.name + ObJ_Hair.num;
document.body.appendChild(hair)
//飞机由上往下 left随机大小0到view宽度
let random_L = randomNum(view.offsetLeft, view.offsetLeft + view.offsetWidth - hair.offsetWidth)
hair.style.left = random_L + 'px'
hair.style.top = 0 + 'px'
ObJ_Hair.arr[ObJ_Hair.num] = hair.id + '|' + hair.offsetLeft + '|' + hair.offsetTop
run_Hair(hair, ObJ_Hair.num)
// 自增1
ObJ_Hair.num += 1
//飞机有最多100个
if (ObJ_Hair.num >= 50) {
ObJ_Hair.num = 0;
}
}
//生成从minNum到maxNum的随机数
function randomNum(minNum, maxNum) {
return parseInt(Math.random() * (maxNum - minNum + 1) + minNum)
}
</script>
</html>
总结：
BUG还是有，就是让他最小化以后 过一会就乱了。。。。还有我用了很多计时器套循环，我担心效率 与内存空间的问题。
当然 还是满激动的。特别是第一次敌机和子弹相遇的时候。就好像电视剧《创业时代》郭鑫年说的 这就是我的孩子一样
