1. Add children configuration on the basis of first-level routing
redirect: route redirection (that is, which page is displayed by default)
2. Combining vue's rout-link tag to achieve jump
to="/parent route/child route"
3. After clicking, the route will automatically add a class name (and switch state)
Class name: .router-link-active
Combining routing redirection (redirect) to realize clicking to switch font color, background and other states.
2. Combining vue's rout-link tag to achieve jump
to="/parent route/child route"
3. After clicking, the route will automatically add a class name (and switch state)
Class name: .router-link-active
Combined with routing redirection, click to switch font color, background and other states.
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