關於「NullReferenceException: Object reference not set to an instance of an object」的思考
1、執行Vector2 screen_xy = Camera.main.WorldToScreenPoint(transform.position)時，報 「NullReferenceException: Object reference not set to an instance of an object」異常報錯。提示對象引用未設置爲對象的實例。 1） 剛開始認爲是transfrom對應
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