if(Inout.GetMosueButton(0))

{

  player.transform.GetChild(0),transform.position+=new Vector3(Input.GetAxis("Mouse X"),0,0);

}

屏幕坐标转世界坐标

Camera.main.ScreenToWorldPoint(new Vector3(Screen.width / 2, Screen.height / 2, 0) + new Vector3(0, 0, 10));