路由配置页router/index.js

routes: [
    {          /* （首页）默认路由地址 */
      path: '/',
      name: 'Entrance',
      component: Entrance,
      meta: {
        title: '首页入口'
      }
    },
    {          /* 修改昵称 */
      path: '/modifyName/:nickName',
      name: 'modifyName',
      component: modifyName,
      meta: {
        title: '修改昵称'
      }
    },
    {          /* 商品详情 */
      path: '/goodsDetail',
      name: 'goodsDetail',
      component: goodsDetail,
      meta: {
        title: '商品详情'
      }
    },
    { /* Not Found 路由，必须是最后一个路由 */
      path: '*',
      component: NotFound,
      meta: {
        title: '找不到页面'
      }
    }
  ]

import router from './router'
router.beforeEach((to, from, next) => {
  /* 路由发生变化修改页面title */
  if (to.meta.title) {
    document.title = to.meta.title
  }
  next()
})