主要原因在于路径配置错误，多层嵌套子路由在router中配置时，其路径为“父组件路径+子组件路径”，例如在下例中：

const routes = [{path: "/",name: "Home",component: Home,children:[{path:'schedule/',name:'Schedule',component:() => import('@/views/schedule/Schedule.vue')children:[{path:'daily',name:'Daily',component:() => import('@/views/schedule/components/Daily.vue')},{path:'weekends',name:'Weekends',component:() => import('@/views/schedule/components/Weekends.vue')}]}]}
]

组件Weekends的路由为“/schedule/weekends”，要在父组件中渲染需要配置router-link（访问链接，相当于html中的标签）及router-view（渲染子组件中的内容）：

  <div><router-link to="/schedule/daily">daily</router-link></div><div><router-link to="/schedule/weekends">weekends</router-link></div><router-view></router-view>