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                            * 作用：為了改變函數體內部this的指向，實現對象和屬性的解耦

* 區別：
    1. call()是從第二參數開始，把需要的參數依次傳遞進去
    2. apply()是把需要的參數放在一個數組中，當做第二個參數傳遞進去
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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