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element的菜单如何定位展开？

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element的菜单如何定位展开？

image.png
输入菜单名后直接调用selected方法，可以打开tab页，但菜单栏不会展开，怎么让菜单栏定位到当前选中的tab页？


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:default-active="activeIndex2"
default-active 当前激活菜单的 index
image

官网参数还是很全的


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