Warning: Encountered two children with the same key, `.$4`. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.
    in ul (created by DOMWrap)
    in DOMWrap (created by Menu)
    in Provider (created by Menu)
    in Menu (created by Menu)
    in Menu (created by Left)
    in div (created by Sider)
    in div (created by Sider)
    in Sider (created by Left)
    in Left (created by Main)
    in div (created by BasicLayout)
    in BasicLayout (created by Adapter)
    in Adapter (created by Main)
    in Main (created by Connect(Main))
    in Connect(Main) (created by Route)
    in Route
    in Switch
    in Router
    in Provider
    in Unknown
    
    
    以上為react錯誤代碼，求解！    
    
    
   問題以解決  把Key的值修改下就可以了