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飞机躲子弹.html
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飞机躲子弹.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
#game{
width: 500px;
height: 500px;
background-color: #000;
margin:30px auto;
position: relative;
}
</style>
</head>
<body>
<div id="game">
</div>
<script>
// window.onload = function(){
// }
;(function(){
function getRandom(n,m){
return n + Math.ceil( (m-n-1) * Math.random() ) ;
}
function Bullet(){
this.ele = document.createElement("span");
this.ele.style.position = "absolute";
this.ele.style.width = "20px";
this.ele.style.height = "20px";
this.ele.style.left = getRandom(0,150) + "px";
this.ele.style.top = getRandom(0,150) + "px";
this.dx = getRandom(5,10);
this.dx = Math.random() > 0.5 ? this.dx : -1 * this.dx;
this.dy = getRandom(5,10);
this.dy = Math.random() > 0.5 ? this.dy : -1 * this.dy;
this.ele.style.backgroundColor = "rgb( "+getRandom(100,255)+" ,"+getRandom(100,255)+" , "+getRandom(100,255)+")";
this.container = document.getElementById("game");
this.container.appendChild(this.ele);
}
Bullet.prototype.destory = function(){
this.container.removeChild(this.ele);
}
Bullet.prototype.move = function(){
// Left : [ 0 , game.with - this.elel.offWidth]
// Top: [ 0 , game.height- this.elel.offHeight]
// 480 = 500 - 20
var oldleft = this.ele.offsetLeft;
if(oldleft > 480 || oldleft < 0){
this.dx = -1 * this.dx;
}
var newLeft = oldleft + this.dx;
this.ele.style.left = newLeft + "px";
var oldtop = this.ele.offsetTop;
if(oldtop > 480 || oldtop < 0){
this.dy = -1 * this.dy;
}
var newtop = oldtop + this.dy;
this.ele.style.top = newtop + "px";
}
function t (e) {
//用来更改 plane 的按钮状态
// this.keystatus[e.keyCode] = true;
if(this.keystatus.hasOwnProperty(e.keyCode)){
plane.keystatus[e.keyCode] = true;
}
}
function keyDown(e){
// console.info(e.keyCode);
t.call(plane,e);
console.info(plane.keystatus);
}
function keyUp(e){
if(plane.keystatus.hasOwnProperty(e.keyCode)){
plane.keystatus[e.keyCode] = false;
}
console.info(plane.keystatus);
}
var plane = {
keystatus:{ //记录当前按钮的状态
38:false,
39:false,
40:false,
37:false
},
ele:document.createElement("div"),
speed:5,
destory:function(){//把自己销毁
//从body中删除
document.getElementById("game").removeChild(this.ele);
},
init:function(){
var that = this;
this.ele.style.position="absolute";
this.ele.style.width = "32px";
this.ele.style.height = "32px";
this.ele.style.background = "url(plane2.png) no-repeat";
this.ele.style.top = (500-32)/2 + "px";
this.ele.style.left = (500-32)/2 + "px";
document.getElementById("game").appendChild(this.ele);
// 添加事件响应
document.body.addEventListener("keydown",keyDown)
document.body.addEventListener("keyup",keyUp)
},
move:function(){
//每次调用move，就是改位置
// console.info(this.keystatus)
//检测 keystatus中的四个属性的值，决定是向哪个方向移动
var oldtop = this.ele.offsetTop,
oldleft = this.ele.offsetLeft;
if(this.keystatus[40]) //下
{//把top改大
var newtop = oldtop + this.speed;
newtop = newtop > (500 - 32) ? 500 - 32 : newtop;
this.ele.style.top = newtop + 'px';
this.ele.style.transform = "rotate(180deg)"; //
}
else if(this.keystatus[38]) //上
{//top改小
var newtop = oldtop - this.speed;
newtop = newtop < 0 ? 0 : newtop;
this.ele.style.top = newtop + 'px';
this.ele.style.transform = "rotate(0deg)"; //
}
if(this.keystatus[39]) //右
{
//把left改大
var newleft = oldleft + this.speed;
newleft = newleft > (500 - 32) ? 500 - 32 : newleft;
this.ele.style.left = newleft + 'px';
this.ele.style.transform = "rotate(90deg)"; //
}
else if(this.keystatus[37]) //左
{
var newleft = oldleft - this.speed;
newleft = newleft < 0 ? 0 : newleft;
this.ele.style.left = newleft + 'px';
this.ele.style.transform = "rotate(-90deg)"; //
}
//同时按下左右，或者上下时 重新旋转角度
if(this.keystatus[37] && this.keystatus[38]){ //左上
this.ele.style.transform = "rotate(-45deg)"; //
}
else if(this.keystatus[39] && this.keystatus[38]){ //右上
this.ele.style.transform = "rotate(45deg)"; //
}
else if(this.keystatus[37] && this.keystatus[40]){ //左下
this.ele.style.transform = "rotate(-135deg)"; //
}
else if(this.keystatus[39] && this.keystatus[40]){ //右下
this.ele.style.transform = "rotate(135deg)"; //
}
}
}
var game = {
destory:function(){
lastTime.destory(); //清除时间lastTime 从页面上删除
for (i = 0; i < this.actors.length; i++) { //清除所有演员： 包括 子弹 和 飞机 从页面上删除
this.actors[i].destory();
}
this.actors = []; //同时把演员对象删除
this.currentNumber = 0; //重置数量
this.lastTime = 0; //重置用户坚持的时间
},
lastTime:0, //用户坚持的时间 ms
over:function(){
var that = this;
var div;
//游戏结束了
if(document.getElementById("divover")){
div = document.getElementById("divover");
div.style.display = "block";
}
else
{
div = document.createElement("div");
div.id = "divover";
div.style.position="absolute";
div.style.zIndex = 2;
div.style.top = 0;
div.style.left = 0;
div.style.bottom = 0;
div.style.right = 0;
div.style.backgroundColor="rgba(0,0,0,.5)";
var button = document.createElement("button");
//按钮放在正中间
button.style.position="absolute";
button.style.top ="200px";
button.style.left = "50%";
button.style.transform = "translateX(-50%)";
button.innerHTML = "再来一次";
button.addEventListener("click",function(){
that.destory();
that.start();
});
div.appendChild(button)
document.getElementById("game").appendChild(div);
}
},
isOver:function(){
var D = 20,
t ,
x,
y,
x1,
y1,
i =0,
flag = false;
//检测所有的子弹与飞机的距离，如果小于 20，则认为是撞上了
// 下面的x,y是飞机正中心
x = plane.ele.offsetLeft + plane.ele.offsetWidth/2;
y = plane.ele.offsetTop + plane.ele.offsetHeight/2;
// console.info(x,y);
for (i = 0; i < this.actors.length; i++) {
t = this.actors[i];
if(t.constructor === Bullet){
//子弹的正中心
x1 = t.ele.offsetLeft + t.ele.offsetWidth /2;
y1 = t.ele.offsetTop + t.ele.offsetHeight/2;
if( Math.pow(D,2) > ( Math.pow(x1-x,2) + Math.pow(y1-y,2)) ){
//撞上了
flag = true;
break;
}
}
}
//
return flag;
},
currentNumber:0,
bulletNumber:10,
actors:[],
timer: 0,
frameIndex:0, //帧数
start:function(){
//开始游戏
if(document.getElementById("divover")){
div = document.getElementById("divover");
div.style.display = "none";
}
var that = this,
i = 0;
// for(i = 0; i< this.bulletNumber; i++){
// this.actors.push ( new Bullet() );
// }
//让飞机就位
plane.init();
//把飞机加到演员表中
this.actors.push(plane);
//让时间就位
lastTime.init();
this.timer = setInterval(function(){
if(that.frameIndex %20 == 0 && that.bulletNumber > that.currentNumber){
// console.info(Date.now());
that.actors.push ( new Bullet() );
that.currentNumber++;
}
that.frameIndex++;
//每隔500ms产生一个子弹
// 第1次产生子弹 frameIndex = 0
// 第2次产生子弹 frameIndex = 20
// 第3次产生子弹 frameIndex = 40
// console.info(that.frameIndex);
for (i = 0; i < that.actors.length; i++) {
that.actors[i].move();
}
if( that.isOver() ) { //撞上了
//停止；
//alert("over");
// console.info("over");
//
that.over();
document.body.removeEventListener("keydown",keyDown);
clearInterval(that.timer);
}
else{
that.lastTime += 25;
lastTime.update(that.lastTime/1000);
//显示坚持的时间
// console.info(that.lastTime / 1000 )
}
},25)
//开始游戏
}
};
var lastTime = {
destory:function(){
document.getElementById("game").removeChild(this.ele);
},
ele:document.createElement("div"),
init:function(){
this.ele.style.color ="#fff";
this.ele.style.position = "absolute";
this.ele.innerHTML = "0";
document.getElementById("game").appendChild(this.ele);
},
update:function(value){
this.ele.innerHTML = "你已经坚持了" + value + "秒";
}
}
game.start();
})();
</script>
</body>
</html>