1.将数据存储在Vuex中管理

export default new Vuex.Store({
  state: {
 
    // 存储token
    Authorization: localStorage.getItem('Authorization') ? localStorage.getItem('Authorization') : ''
  },
  mutations: {
    // 修改token，并将token存入localStorage
    changeLogin (state, user) {
      state.Authorization = user.Authorization;
      localStorage.setItem('Authorization', user.Authorization);
    },
    // 改变用户id值，从而切换账号
    changeUserId(state,userId){
      state.userId = userId;
    }
  }
});

2.登录页中实现登录时，由服务器返回的token存储到Vuex中

login() {
      ....

      // 提交表单时，都要预先验证
      this.$refs.loginFormRef.validate(async (valid) => {
        if (!valid) return;
        // axios返回的是 Promise对象
        this.$http
          .post("/users/login", {
            username: this.loginForm.username,
            password: this.loginForm.password,
          })
          .then(
            (response) => {

                 ....

              } else {

                this.userToken = "Bearer " + res.token;

                // 将用户token保存到vuex中
                this.changeLogin({ Authorization: this.userToken }); 
 
                ....       }

           },
            (error) => {
              this.$message.error(error);
            }
          );
        
      });
    },

3.在main.js文件中根据token的有关实现路由守卫和axios拦截

// 使用 router.beforeEach 注册一个全局前置守卫，判断用户是否登陆
router.beforeEach((to, from, next) => {
  if (to.path === '/login') {
    next();
  } else {
    let token = localStorage.getItem('Authorization');
    console.log(token)
    if (token === null || token === '') {
      next('/login');
    } else {
      if (to.matched.length === 0) {
        next('/404')
      } else {
        next();
      }
    }
  }
});

// 添加请求拦截器，在请求头中加token
axios.interceptors.request.use(
  config => {
    if (localStorage.getItem('Authorization')) {
      config.headers.Authorization = localStorage.getItem('Authorization');
    }
    return config;
  },
  error => {
    return Promise.reject(error);
  });