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                            ![](https://img.kancloud.cn/d0/db/d0dbbfbf9eb209ef01ff5a2d231af9bd_1148x625.png)

如果new dog()可以調用sayname，bark，
如果 dog()  不加new，就把dog當普通函數執行，和sayname，bark沒有關系。
![](https://img.kancloud.cn/1f/b5/1fb5bf108fe70177e676b9102c4adbeb_650x274.png)
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![](https://img.kancloud.cn/f6/77/f67760e539879ec9fc41d9c163021672_832x308.png)

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![](https://img.kancloud.cn/0c/71/0c71d67884734c905309d573c6286d31_1145x422.png)

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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