某种飞机的子弹效果

//子弹起名bullet
//飞机起名smallplane
_root.onLoad=function(){
templ=2.5;
tempr=-2.5;
L=-7.5;
R=7.5;
initialize=false;
starts=false
speed=3;
bullet._visible=false;
}
a=new Object();
Key.addListener(a);
a.onKeyDown=function(){//按数字键0激发动作.
if(Key.isDown(96)){initialize=true;}
}
function initializebullet_L(){//初始化左路的子弹。

L+=smallplane._x;//左路起始位置初始
for(var i=1;i<=11;i++){
bullet.duplicateMovieClip("bulletl"+i,i+50);//复制，设位.
eval("bulletl"+i)._y=smallplane._y-18-i*eval("bulletl"+i)._height;
eval("bulletl"+i)._x=L+templ;
templ*=-1;//交错就拿这个变理来做啦
}
L=-7.5;
}
function initializebullet_R(){//右路
R+=smallplane._x;
for(var j=1;j<11;j++){
bullet.duplicateMovieClip("bulletr"+j,j+60);
eval("bulletr"+j)._y=smallplane._y-18-j*eval("bulletr"+j)._height;
eval("bulletr"+j)._x=R+tempr;
tempr*=-1;
}
R=7.5;
}
function Motion(){//和上面初始化的思路差不多，只不过放在一起做了。
L+=smallplane._x;
R+=smallplane._x;
while(i<=11&&j<=11){
eval("bulletl"+i)._y=smallplane._y-18-i*eval("bulletl"+i)._height;
eval("bulletr"+j)._y=smallplane._y-18-j*eval("bulletr"+j)._height;
eval("bulletl"+i)._x=L+templ;
eval("bulletr"+j)._x=R+tempr;
templ*=-1;
tempr*=-1;
i++;j++;
}
templ*=-1;
L=-7.5;
R=7.5;
}
_root.onEnterFrame=function(){//先初始后再做动画，按数字键0激发.
if(initialize){initializebullet_L();initializebullet_R();initialize=false;starts=true;}
if(initialize==false&&starts==true){
Motion();
//trace(templ);
}

if( Key.isDown(Key.LEFT))smallplane._x -= speed;
if( Key.isDown(Key.RIGHT))smallplane._x += speed;
if( Key.isDown(Key.UP))smallplane._y -= speed;
if( Key.isDown(Key.DOWN))smallplane._y += speed;
}