SpaceInvader作業

改變鍵盤事件
function doKeys()
// 改變高度，讓入侵者打不到， 或改為3D模式
if( keys.l && playerMoveEnable )   
 {
    objects.Player_1.pos.z += playerMoveSpeed;
 }
    if( keys.k && playerMoveEnable )   
 {
    objects.Player_1.pos.z -= playerMoveSpeed;
 }
// 增加 y方向移動
   if( keys.up && playerMoveEnable )   
 {
    objects.Player_1.pos.y += playerMoveSpeed;
 }
   if( keys.down && playerMoveEnable )   
 {
    objects.Player_1.pos.y -= playerMoveSpeed;
 }
// 改a,d 為 left, right 鍵
 if( keys.right && playerMoveEnable )   
 {
    objects.Player_1.pos.x += playerMoveSpeed;
  if( objects.Player_1.pos.x > 15 )objects.Player_1.pos.x = 15;
 }
 if( keys.left && playerMoveEnable )   
 {
  objects.Player_1.pos.x -= playerMoveSpeed;
  if( objects.Player_1.pos.x < 0 )objects.Player_1.pos.x = 0;
 }