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                            ## 面向對象的程序設計

面向對象（object-oriented，OO）的語言有一個標志，那就是它們都有類的概念，而通過類可以創建任意多個具有相同屬性和方法的對象。前面提過，ECMAScript 中沒有類的概念（在es6中是有類的概念），因此它的對象也與基于類的語言的對象有所不同。

ECMA-262 把對象定義為：“無序屬性的集合，其屬性可以包含”
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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