Unity3d 鼠标拾取 javascript

 function Update ()      {        if (Input.GetMouseButton (0))           {             var ray = Camera.main.ScreenPointToRay (Input.mousePosition);            var hit : RaycastHit;             if (Physics.Raycast (ray, hit))              {                 Debug.DrawLine (ray.origin, hit.point);                 print(hit.collider.gameObject.name);            }         }     }