制作于2018.2.14，基于Unity2017.3
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));
