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                            1. 相同點：`v-if` 和`v-show` 都會控制元素的出現和消失
2. 不同點：
`v-if` ：每次都會重新刪除或創建元素，性能消耗較大，頻繁切換顯示時，推薦v-show
`v-show` ：每次不會重新進行DOM的刪除和創建操作，只是切換了元素的display: none樣式，初始渲染消耗大，顯示的幾率比較小時，推薦v-if，因為v-show會保留創建元素 
3. v-if可以配合v-else實現兩個組件(元素)的切換
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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