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                            #### 相同點

命名規范都必須以字母或下劃線開頭，后面跟字母，數字或下劃線

#### 不同點

*   常量前面沒有美元符號`$`
*   常量只能通過`define()`或`const`定義，而不能通過賦值語句
*   常量可以不用理會變量的作用域而在任何地方定義和訪問
*   常量一旦定義就不能被重新定義或者取消定義
*   常量的值只能是標量
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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