// router文件夹下的 index.js
import Vue from "vue";
import Router from "vue-router";
import routes from "./routes";  // 配置的路径

Vue.use(Router);

const router = new Router({
  routes,
  scrollBehavior
  // mode: 'history'
});

const router = new Router({
  routes,
  scrollBehavior
  // mode: 'history'
});

router.beforeEach((to, from, next) => {
  if (to.matched.some(route => route.meta && route.meta.requiresAuth)) {
    if (!this.$storage.getStorage("userInfo")) {  // 没有登录信息跳转到登录页
      next({
        path: "/login",
        query: { redirect: to.fullPath }  // 'to.fullPath'跳转到登录之前页面的路径
      });
    } else {
      next();
    }
  } else {
    next();
  }
});
export default router;

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在登陆页面（ login.vue里 ）

<template>
  <div class="login-container">
    <van-form @submit="onSubmit">
      <van-field v-model="username" label="用户名" placeholder="用户名" required />
      <van-field v-model="password" type="password" label="密码" placeholder="密码" required />
      <div style="margin: 40px 0 0 0;">
        <van-button round block type="info" size="small" native-type="submit">提交</van-button>
      </div>
    </van-form>
  </div>
</template>

<script>
import { webLogin } from '@/apis/apis'
export default {
  data() {
    return {
      username: '',
      password: '',
    }
  },
  created() { },
  methods: {
    onSubmit() {
      if (!this.username) {
        this.$notify({ type: "danger", message: "请填写用户名" });
        return;
      } else if (!this.password) {
        this.$notify({ type: "danger", message: "请填写密码" });
        return;
      }
      let params = {
        username: this.username,
        password: this.password
      }
      webLogin(params).then(res => {
        if (res.code == 0) {
          this.$notify({ type: 'success', message: '恭喜，登录成功！' });
          // this.$router.push('/user'); 
          this.$storage.setStorage('userInfo', res.data);
          setTimeout(() => {
            let path = '/user';   // '/user' 为个人中心页面
            if (this.$route.query.redirect) {
              path = this.$route.query.redirect   // 跳到之前的页面
            }
            this.$router.push({
              path: path
            });
          }, 1000)
        } else {
          this.$notify(res.message)
        }
      })
    }
  }
}
</script>