//自身的对象
var selfPlane={
x:0,
y:0,
score:0,
e:null,
init:function(){
this.x=(Util.windowWidth-Util.selfPlaneElement.width)/2;//相对于父窗体的x偏移(css:left)
this.y=Util.windowHeight-Util.selfPlaneElement.height;//相对于父窗体的y偏移(css:top)
this.e=Util.selfPlaneElement;//对应的dom元素
Util.selfPlaneElement.style.left=this.x+"px";
Util.selfPlaneElement.style.top=this.y+"px";
Util.parentElement.appendChild(this.e);
},
move:function(moveX,moveY){
var x=this.x+moveX;
var y=this.y+moveY;
if(x<0-this.e.width/2||x>Util.windowWidth-this.e.width/2){
return ;
}
if(y<0-this.e.height/2||y>Util.windowHeight-this.e.height/2){
return ;
}
this.x=x;
this.y=y;
this.e.style.left=this.x+"px";
this.e.style.top=this.y+"px";
},
moveTo:function(x,y){
if(x<0-this.e.width/2||x>Util.windowWidth-this.e.width/2){
return ;
}
if(y<0-this.e.height/2||y>Util.windowHeight-this.e.height/2){
return ;
}
this.x=x;
this.y=y;
this.e.style.left=this.x+"px";
this.e.style.top=this.y+"px";
}
}
//敌机的类
var enemyPlane=function(x,y,speed){
this.x=x;
this.y=y;
this.e=Util.enemyPlaneElement.cloneNode(true);
this.e.style.left=x;
this.e.style.top=y;
this.e.style.display="none";
Util.parentElement.appendChild(this.e);
this.e.style.display="block";
this.speed=speed;
this.isDied=false;
}
//prototype:原型
enemyPlane.prototype.move=function(moveX,moveY){
this.x+=moveX;
this.y+=moveY;
this.e.style.left=this.x+"px";
this.e.style.top=this.y+"px";
}
//敌人复活
enemyPlane.prototype.restore=function(){
this.x=Math.random()*(Util.windowWidth-Util.enemyPlaneElement.width);
this.y=-Math.random()*Util.windowHeight-Util.enemyPlaneElement.height;
this.speed=2+Math.random()*4;
this.e.style.left=this.x+"px";
this.e.style.top=this.y+"px";
this.isDied=false;
}
//敌机工厂
var enemyPlaneFactory={
enemys:[],
creatEnemyPlane:function(n){
for(var i=0;i<n;i++){
//0~1 乘以窗口宽度，得到的就是从0~窗口宽度的一个随机x值
var x=Math.random()*(Util.windowWidth-Util.enemyPlaneElement.width);
var y=-Math.random()*Util.windowHeight-Util.enemyPlaneElement.height;
var speed=2+Math.random()*4;
var ep=new enemyPlane(x,y,speed);
this.enemys.push(ep);
}
}
}
//子弹
var bullet=function(x,y,speed){
this.x=x;
this.y=y;
this.speed=speed;
this.e=Util.bulletElement.cloneNode(true);
this.e.style.left=this.x+"px";
this.e.style.top=this.y+"px";
Util.parentElement.appendChild(this.e);
this.iSUSEd=false;
}