unity3d RaycastHit

//用射线检测碰撞,拾取

Js代码  
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);    
        }    
    }    
}