vue-路由动态切换title

 {
      path: ‘/nav‘,
      component: () => import(‘../view/nav.vue‘),
      meta:{
        title:‘nav‘,
      }
    },
    {
      path: ‘/haha‘,
      component: () => import(‘../view/haha.vue‘),
      meta:{
        title:‘haha‘
      }
    }

router.beforeEach((to, from, next) => {
  /* 路由发生变化修改页面meta */
  if(to.meta.content){
    let head = document.getElementsByTagName(‘head‘);
    let meta = document.createElement(‘meta‘);
    meta.content = to.meta.content;
    head[0].appendChild(meta)
  }
  /* 路由发生变化修改页面title */
  if (to.meta.title) {
    document.title = to.meta.title;
  }
  next()
});