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                            ## map與forEach的區別？
1、`forEach`方法，是最基本的方法，就是遍歷與循環，默認有3個傳參：分別是遍歷的數組內容`item`、數組索引`index`、和當前遍歷數組`Array`  
2、`map`方法，基本用法與`forEach`一致，但是不同的，它會返回一個新的數組，所以在`callback`需要有`return`值，如果沒有，會返回`undefined`
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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