vue後臺管理系統學習(7)--再看用戶登錄

用戶登錄和權限分配這塊還是挺繞的，自己目前還沒研究透徹，但是知道流程是這樣的

1. 登錄流程

   首先在登錄頁面，點擊登錄按鈕，調用handleLogin方法

   

handleLogin() {
      this.$refs.loginForm.validate(valid => {
        if (valid) {
          this.loading = true
          this.$store.dispatch('user/login', this.loginForm)
            .then(() => {
              this.$router.push({ path: this.redirect || '/', query: this.otherQuery })
              this.loading = false
            })
            .catch(() => {
              this.loading = false
            })
        } else {
          console.log('error submit!!')
          return false
        }
      })
    },

  然後會調用mock/user.js中的user/login api接口，執行成功後，會調用全局狀態管理中src/store/modules/user.js的login，把token信息存入cookie,  這樣就登錄成功了,然後轉向首頁

 login({ commit }, userInfo) {
    const { username, password } = userInfo
    console.log('登錄login')
    console.log(userInfo)
    return new Promise((resolve, reject) => {
      login({ username: username.trim(), password: password }).then(response => {
        const { data } = response
        commit('SET_TOKEN', data.token)
        setToken(data.token)
        resolve()
      }).catch(error => {
        reject(error)
      })
    })
  },

 

2.權限判斷

   用戶登錄成功後，會在全局鉤子(src/permission.js)中router.beforeEach中進行攔截，讀取cookie,判斷用戶是否擁有角色

 

router.beforeEach(async(to, from, next) => {
  // start progress bar
  NProgress.start()

  // set page title
  document.title = getPageTitle(to.meta.title)
  console.log('開始攔截')
  // determine whether the user has logged in
  const hasToken = getToken()

  if (hasToken) {
    if (to.path === '/login') {
      // if is logged in, redirect to the home page
      next({ path: '/' })
      NProgress.done()
    } else {
      // determine whether the user has obtained his permission roles through getInfo
      const hasRoles = store.getters.roles && store.getters.roles.length > 0
      if (hasRoles) {
        next()
      } else {
        try {
          // get user info
          // note: roles must be a object array! such as: ['admin'] or ,['developer','editor']
          const { roles } = await store.dispatch('user/getInfo')

          // generate accessible routes map based on roles
          const accessRoutes = await store.dispatch('permission/generateRoutes', roles)

          // dynamically add accessible routes
          router.addRoutes(accessRoutes)

          // hack method to ensure that addRoutes is complete
          // set the replace: true, so the navigation will not leave a history record
          next({ ...to, replace: true })
        } catch (error) {
          // remove token and go to login page to re-login
          await store.dispatch('user/resetToken')
          Message.error(error || 'Has Error')
          next(`/login?redirect=${to.path}`)
          NProgress.done()
        }
      }
    }
  } else {
    /* has no token*/

    if (whiteList.indexOf(to.path) !== -1) {
      // in the free login whitelist, go directly
      next()
    } else {
      // other pages that do not have permission to access are redirected to the login page.
      next(`/login?redirect=${to.path}`)
      NProgress.done()
    }
  }
})

  然後會在src/store/modules/permission.js中添加路由，然後在側邊欄src\layout\components\Sidebar\index.vue 中讀取路由

 <sidebar-item v-for="route in permission_routes" :key="route.path" :item="route" :base-path="route.path" />

   這樣就把擁有權限的菜單顯示出來了