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                            [邏輯運算符](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Logical_Operators "邏輯運算符通常用于布爾型（邏輯）值。這種情況下，它們返回一個布爾值。然而，&& 和 || 運算符會返回一個指定操作數的值，因此，這些運算符也用于非布爾值。這時，它們也就會返回一個非布爾型值。")
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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