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new_file.js
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new_file.js
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function star(){
var start = document.getElementById("start");
start.style.backgroundImage = "none";
//背景图滚起来
var oBg1 = document.getElementById("bg1");
var oBg2 = document.getElementById("bg2");
var timer = setInterval(function(){
oBg1.style.top = oBg1.offsetTop + 1 +"px";
oBg2.style.top = oBg2.offsetTop + 1 +"px";
if(oBg1.offsetTop >= 700){
oBg1.style.top = "-700px";
}
if(oBg2.offsetTop >= 700){
oBg2.style.top = "-700px";
}
},10)
//飞机位置变化
//获取飞机位置
var oPlane = document.getElementById("airplane");
oPlane.addEventListener("click",function(e){
var ev = e || window.event;
var planeX = ev.pageX;
var planeY = ev.pageY;
var moveX = 0;
var moveY = 0;
// console.log(planeX,planeY);
//让飞机随鼠标移动
document.getElementById("box").addEventListener("mousemove",function(e){
var en = e || window.event;
moveX = en.pageX - planeX;
planeX = en.pageX;
moveY = en.pageY - planeY;
planeY = en.pageY;
// console.log(en.pageX,en.pageY);
// console.log(moveX,moveY);
oPlane.style.left = oPlane.offsetLeft + moveX + "px";
oPlane.style.top = oPlane.offsetTop + moveY +"px";
},false)
},false)
//发射子弹
var timerbullet = setInterval(function(){
var bullet = document.createElement("div");
box.appendChild(bullet);
bullet.className = "bullet";
bullet.time = timerfly;
bullet.style.top = oPlane.offsetTop - 10 + "px";
bullet.style.left = oPlane.offsetLeft + 25 + "px";
//让子弹动起来
var timerfly = setInterval(function(){
bullet.style.top = bullet.offsetTop - 10 +"px";
if(bullet.offsetTop <= -20){
clearInterval(timerfly);
box.removeChild(bullet);
}
},50)
},500)
//敌人下落
//创建坦克
var timertank = setInterval(function(){
var tank = document.createElement("div");
box.appendChild(tank);
tank.className = "tank";
tank.time = timerrun;
tank.style.top = "0px";
//随机数函数封装
function Random(min,max){
return Math.random() * (max-min) + min;
}
tank.style.left = Random(0,550) + "px";
//让tank动起来
var timerrun = setInterval(function(){
tank.style.top = tank.offsetTop + 10 +"px";
if(tank.offsetTop >= 700){
clearInterval(timerrun);
box.removeChild(tank);
}
},50)
},1000)
//子弹与坦克碰撞检测
// var numL = 0;
// var num = document.getElementById("num");
var pzjc = setInterval(function(){
var allTank = document.getElementsByClassName("tank");
var allBullet = document.getElementsByClassName("bullet");
//生成分数
for(var i = 0;i < allTank.length;i++){
for(var j = 0;i < allBullet.length;j++){
var t = allTank[i];
var b = allBullet[j];
if(check_box_collision(b,t)){
clearInterval(t.time);
clearInterval(b.time);
box.removeChild(t);
box.removeChild(b);
break;
}
}
}
},50)
// console.log(numL);
// if(num < 10){
// num.innerHTML = "0" + numL ;
// }else{
// num.innerHTML = numL;
// }
//飞机和坦克碰撞
var pzjcdie = setInterval(function(){
var allTank = document.getElementsByClassName("tank");
for(var i = 0;i < allTank.length;i++){
var t = allTank[i];
if(check_box_collision(oPlane,t)){
for(var j = 0;j < 100;j++){
clearInterval(j);
}
}
}
},50)
//封装函数
function check_box_collision(thingA,thingB){
var left1 = parseInt(window.getComputedStyle(thingA).left);
var left2 = parseInt(window.getComputedStyle(thingB).left);
var top1 = parseInt(window.getComputedStyle(thingA).top);
var top2 = parseInt(window.getComputedStyle(thingB).top);
var height1 = parseInt(window.getComputedStyle(thingA).height);
var height2 = parseInt(window.getComputedStyle(thingB).height);
var width1 = parseInt(window.getComputedStyle(thingA).width);
var width2 = parseInt(window.getComputedStyle(thingB).width);
var center1 = {
x : left1 + width1 / 2,
y : top1 + height1 / 2
}
var center2 = {
x : left2 + width2 / 2,
y : top2 + height2 / 2
}
var distanceX = Math.abs(center1.x - center2.x);
var distanceY = Math.abs(center1.y - center2.y);
if(distanceX <= (width1 + width2)/2 && distanceY <= (height1 + height2)/2){
return true;
}else{
return false;
}
}
}