引入js文件

    <script type="text/javascript" src="js/Sound.js"> </script>

    <script type="text/javascript" src="js/Background.js"> </script>
    <script type="text/javascript" src="js/Mouse.js"> </script>
    <script type="text/javascript" src="js/Loader.js"> </script>
    <script type="text/javascript" src="js/FloatyText.js"> </script>
    <script type="text/javascript" src="js/Keyboard.js"> </script>
    <script type="text/javascript" src="js/Collision.js"> </script>

    <script type="text/javascript" src="js/AfterEffect.js"> </script>
    <script type="text/javascript" src="js/PeaShooter.js"> </script>
    <script type="text/javascript" src="js/Laser.js"> </script>
    <script type="text/javascript" src="js/LevelDirector.js"> </script>
    <script type="text/javascript" src="js/Sortie.js"> </script>
    <script type="text/javascript" src="js/Enemy.js"> </script>

    <script type="text/javascript" src="js/Powerup.js"> </script>
    <script type="text/javascript" src="js/Shot.js"> </script>
    <script type="text/javascript" src="js/EnemyShot.js"> </script>
    <script type="text/javascript" src="js/Ship.js"> </script>

    <script type="text/javascript">

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