Vue路由守卫详解及其应用场景分析

router.beforeEach((to, from, next) => {
  // 进行权限验证等操作
  if (to.meta.requireAuth) {
    if (localStorage.getItem('token')) {
      next();
    } else {
      next({
        path: '/login',
        query: {redirect: to.fullPath}
      })
    }
  } else {
    next();
  }
})

router.afterEach((to, from) => {
  // 记录日志等操作
})

router.beforeResolve((to, from, next) => {
  // 进行路由解析后的处理
  next();
})

const router = new VueRouter({
  routes: [
    {
      path: '/admin',
      component: Admin,
      beforeEnter: (to, from, next) => {
        // 进行权限验证等操作
        if (localStorage.getItem('admin')) {
          next();
        } else {
          next({
            path: '/login',
            query: {redirect: to.fullPath}
          })
        }
      }
    }
  ]
})

export default {
  data() {
    return {
      user: null
    }
  },
  beforeRouteEnter(to, from, next) {
    const user = localStorage.getItem('user')
    if (user) {
      // 访问不到组件实例
      next(vm => {
        vm.user = user
      })
    } else {
      next({
        path: '/login',
        query: {redirect: to.fullPath}
      })
    }
  }
}

export default {
  data() {
    return {
      text: ''
    }
  },
  beforeRouteLeave(to, from, next) {
    if (this.text !== '') {
      const confirmMsg = '您的修改还未保存，确定要离开吗？'
      if (confirm(confirmMsg)) {
        next();
      } else {
        next(false);
      }
    } else {
      next();
    }
  }
}

export default {
  data() {
    return {
      user: null
    }
  },
  beforeRouteUpdate(to, from, next) {
    const user = localStorage.getItem('user')
    if (user) {
      this.user = user
      next();
    } else {
      next({
        path: '/login',
        query: {redirect: to.fullPath}
      })
    }
  }
}

export default {
  beforeRouteRender(to, from, next) {
    // 进行服务器端渲染等操作
    next();
  }
}