1.修改router中index.js文件中每个路由加上meta:{ title: ‘首页’}

const router = new Router({
    mode: '',
    routes: [
        {
            path: '/',
            name: '',
            component: ,
            meta:{
                // 
                title: '首页'
            }
        }
    ]
})

2.main.js中加上

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()
})