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從ExtJS的文檔：ExtJS中HBox和VBox佈局的flex值有什麼用處？
flex : Number
This configuration option is to be applied to child items of the container managed by this
layout. Each child item with a flex property will be flexed horizontally according to each
item's relative flex value compared to the sum of all items with a flex
value specified. Any child items that have either a flex = 0 or flex = undefined will not
be 'flexed' (the initial size will not be changed).
但文檔不給它如何影響佈局以及如何使用它一個清晰的應用程序。此外，我找不到有關如何在Google上使用它的任何優秀教程/示例。
欣賞是否有人能夠更多地瞭解這一點。