docs: add tips
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		@@ -24,7 +24,7 @@ router.beforeEach(async(to, from, next) => {
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    if (to.path === '/login') {
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					    if (to.path === '/login') {
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      // if is logged in, redirect to the home page
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					      // if is logged in, redirect to the home page
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      next({ path: '/' })
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					      next({ path: '/' })
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      NProgress.done()
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					      NProgress.done() // hack: https://github.com/PanJiaChen/vue-element-admin/pull/2939
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    } else {
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					    } else {
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      // determine whether the user has obtained his permission roles through getInfo
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					      // determine whether the user has obtained his permission roles through getInfo
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      const hasRoles = store.getters.roles && store.getters.roles.length > 0
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					      const hasRoles = store.getters.roles && store.getters.roles.length > 0
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