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                            # **從一個需求談起**
* * * * *
由于后端通常采用的是關系型數據庫，所以返回的數據通常是扁平化的數據，就有可能涉及到前端算法把扁平化數據轉換成嵌套型數據。
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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