/// <summary>播放一个3D声音</summary>
 public void PlaySound3D(string soundName, Transform target, bool isLoop = false, DelSoundCallback callback = null)
 {
     playSound(soundName, target, isLoop, callback);
 }
 /// <summary>播放一个2D声音</summary>
 public void PlaySound2D(string soundName, bool isLoop = false, DelSoundCallback callback = null)
 {
     playSound(soundName, null, isLoop, callback);
 }