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                ### 拖拽和繼承 - 面向對象的拖拽 - 改寫原有拖拽,代碼同下 - 對象的繼承 - 什么是繼承 - 在原有類的基礎上略作修改,得到一個新類 - 不影響原有類的功能 - `instanceof` 運算符:返回 `true`,如果對象是對象類型的實例。 - **查看對象是否是某個類的實例**
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