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                            **函數聲明**

![](https://img-blog.csdn.net/2018072520351760?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N0b3J5b2Nv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70)

**函數表達式**

![](https://img-blog.csdn.net/2018072520351757?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N0b3J5b2Nv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70)
**區別**
1、函數聲明會被提升到當前作用域的頂部，函數表達式則不會。

2、函數聲明一定會有函數名，而函數表達式一般不會有函數名。

3、函數聲明不是一個完整的語句，所以不能出現在if-else,for循環，inally，try catch語句以及with語句中,

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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