登录过期逻辑

现在普遍的登录权限校验方式是JWT （json web token），当登录成功时，前端页面会获得一个 token ，每个 token 都设置了过期时间，通过解析 token 即可判断出 token 是否过期。

token 过期，即登录过期。

核心技术

前端项目安装依赖 jsonwebtoken 和 dayjs

cnpm i -S jsonwebtoken
cnpm i -S dayjs

src\router\index.js 中使用它们

import jwt from "jsonwebtoken";
import moment from "dayjs";

解析token

const payload = jwt.decode(token);

判断token是否过期

moment().isAfter(moment(payload.exp * 1000))

• moment() 即当前时间
• moment(payload.exp * 1000) 是token的过期时间
• isAfter() 用于判断当前时间是否晚于token的过期时间

完整代码范例

src\router\index.js

import Vue from "vue";
import VueRouter from "vue-router";
import store from "@/store";
import { store_State_init } from "@/store";
import jwt from "jsonwebtoken";
import moment from "dayjs";
import { Message } from "element-ui";Vue.use(VueRouter);const routes = [{ path: "/", redirect: "/index/content" },{path: "/index",component: (resolve) => require(["@/views/index/index.vue"], resolve),children: [{path: "content",name: "首页的内容（首页中的首页）",component: (resolve) => require(["@/views/index/content.vue"], resolve),},{path: "members",name: "成员",component: (resolve) => require(["@/views/members/index.vue"], resolve),},// 博客{path: "blog",meta: { requiresAuth: true },component: (resolve) => require(["@/views/blog/index.vue"], resolve),},{path: "*",component: (resolve) =>require(["@/views/otherPages/404.vue"], resolve),},],},// 注册{path: "/register",component: (resolve) => require(["@/views/register/index.vue"], resolve),},// 登录{path: "/login",component: (resolve) => require(["@/views/login/index.vue"], resolve),},// 作品{path: "/index/works",component: (resolve) => require(["@/views/works/index.vue"], resolve),},// 重置密码{path: "/resetPassword",component: (resolve) =>require(["@/views/resetPassword/index.vue"], resolve),},// 用户中心{path: "/userCenter",meta: { requiresAuth: true },component: (resolve) => require(["@/views/userCenter/index.vue"], resolve),},// 404 表示请求的页面不存在、已被删除或无法访问{path: "/404",component: (resolve) => require(["@/views/otherPages/404.vue"], resolve),},// 未匹配到的路由，重定向到 /404{ path: "*", redirect: "/404" },
];const router = new VueRouter({routes,
});// 全局路由守卫
router.beforeEach((to, from, next) => {const token = store.state.token;if (token) {const payload = jwt.decode(token);// token过期 —— 当前时间超过token的过期时间if (moment().isAfter(moment(payload.exp * 1000))) {sessionStorage.clear();// 重置 vuexstore.replaceState(store_State_init);Message({offset: 150,message: "登录已过期！",type: "warning",});}}// 需鉴权的路由—— 判断路由的meta元数据中，是否requiresAuth为trueif (to.matched.some((record) => record.meta.requiresAuth)) {// 判断用户是否已登录if (store.state.isLogin) {// 已登录，则跳转到目标路由（需要用户登录的页面）next();} else {// 未登录，跳转到登录页next("/login");}} else {// 公共页面，直接跳转到目标路由next();}
});export default router;