//router内的设置
{
   path: '/teachers',
   name: 'TDetail',
   component: TDetail,
   meta: {
    title:"教师详情",
    content: 'disable'
   }
  },
  {
   path: '/article',
   name: 'Article',
   component: Article,
   meta: {
    title: "文章详情",
    content: 'disable-no'
   }
  },
 //main.js里面的代码
 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()
});