<keep-alive>
   <router-view v-if="$route.meta.keepAlive"></router-view>
  </keep-alive>
  <router-view v-if="!$route.meta.keepAlive"></router-view>

  {
    path: '/backstage',
    component: resolve => require(['@/views/backstage/my'], resolve),
    meta: { keepAlive: false }
  },
  {
    path: '/backstage/info',
    component: resolve => require(['@/views/backstage/my/info'], resolve),
    meta: { keepAlive: false }
  },

export default {
  data() {
    return {};
  },
  methods: {},
  beforeRouteLeave(to, from, next) {
    // 设置下一个路由的 meta
    to.meta.keepAlive = false; // 不缓存
    // to.meta.keepAlive = true; // 缓存
    next();
  }
};

export const mixin = {
 data () {
  return {
   activatedFlag: false
  };
 },
 mounted () {
  this.activatedFlag = true;
 },
 activated () {
  this.activatedFlag = true;
 },
 deactivated () {
  this.activatedFlag = false;
 }
};