Collision 中带有碰撞的信息，例如：速度和撞击到的点

 void OnCollisionEnter2D(Collision2D coll) 

{       foreach(ContactPoint contact in coll.contacts)

   {

         contact.point;//

   }    }

Collider是由影响的对象

 void OnTriggerEnter2D(Collider2D other) 

{      other.gameObject.transform.position;

}