一、vuex

一般的，用户登录后会在本地持久化存储用户的认证信息，本文以JWT的token为例。将用户的token持久化到localStorage里，而用户信息则存在内存(store)中。

state: {
  token: "",
  userName: ""
},
mutations: {
  set_token(state, token) {
    state.token = "JWT " + token;
    localStorage.setItem("token", token);
  },
  del_token(state) {
    state.token = "";
    localStorage.removeItem("token");
  },
  setUserInfo(state, userName) {
    state.userName = userName;
  }
},
});

二、登录成功时将token持久化到localStorage

          this.$axios
            .post("/api/users/login", this.form)
            .then(res => {
              res = res.data;
              if (res.code == 0) {
                this.isLogin = true;
                this.$store.commit("set_token", res.data.token);
                this.$store.commit("setUserInfo", res.data.username);
                if (this.$store.state.token) {
                  this.$router.push("/");
                } else {
                  this.$router.replace("/login");
                }
              }

三、main.js中的axios

axios.interceptors.request.use(
config => {
  //在所有请求头部添加token值
  const token = store.state.token;
  if (token) {
    config.headers.Authorization = token;
  }
  return config;
},
error => {
  console.log("err");
  return Promise.reject(error);
}
);
// response 拦截器
axios.interceptors.response.use(
response => {
  return response;
},
error => {
  if (error.response) {
    switch (error.response.status) {
      case 401:
        this.$store.commit("del_token");
        router.replace({
          path: "/login",
          query: { redirect: router.currentRoute.fullPath } //登录成功后跳入浏览的当前页面
        });
    }
  }
  return Promise.reject(error.response.data);
}
);

四、router.js权限路由配置

某些页面规定必须登录后才能查看 ，可以再router中配置meta，将需要登录的requireAuth设为true，

    {
      path: "/",
      name: "home",
      component: () => import("./views/Home.vue"),
      meta: {
        requireAuth: true,
      }
    },
    {
      path: "/login",
      name: "login",
      component: () => import("./views/login/login.vue"),
    },

然后设置路由守卫，在进页面之前，判断有token，才进入页面，否则返回登录页面。

if (localStorage.getItem("token")) {
store.commit("set_token", localStorage.getItem("token"));
}
router.beforeEach((to, from, next) => {
if (to.matched.some(r => r.meta.requireAuth)) {
  if (store.state.token) {
    next();
  } else {
    next({
      path: "/login"
    });
  }
} else {
  next();
}
});