vue 路由判断方式

methods: { 
      // 增加阅读人数
      setpeople(){
        console.log('定时器开启');
        // overTimer 这个值可以写在data里面 
        //也可以直接用 const overTimer = setTimeout(() =>{},15000)
        this.overTimer = setTimeout(() => {
          this.artical_peo = this.artical_peo + 1
          this.setpeo()
        }, 15000)
      },
      // 修改阅读人数
      setpeo(){
        let params = `artical_peo=${this.artical_peo}&&id=${this.id}`
        this.axios.put('/read',params).then(res=>{
          // console.log(res);
        })
      },

        // 超时定时器
        overTimer: 15000,
        sname:''
      }
    },
    // 监测路由跳转
    beforeRouteEnter (to, from, next) {
       console.log('要跳到的页面',to.name)
       console.log('从那个页面跳过来',from.name)
      //  console.log(next)
      next(vm =>{
        //这里把获取到的from.name给到data里面定义的sname
        vm.sname = from.name
        // console.log(vm.sname);
      });
    },

mounted () {
      // 判断当前跳转过来的页面如果是 scang 就不启动定时器
      if(this.sname == 'Scang'){
        //清除定时器
        clearTimeout(this.setpeople)
      }else{
        // 开启定时器 当点进来浏览够15秒后阅读量加一
        this.setpeople()
      }
    },

import PageNotFound from '@/views/pages/404.vue'
Vue.use(Router)
const routes=[
  {
    path: '*',
    name: 'PageNotFound',
    component: PageNotFound,
  },
]
 
const router = new Router({
  mode: 'history',
  routes: routes
})
 
router.beforeEach((to, from, next) => {
  //  从其他地方访问是否有这个地址
    if(to.matched.length == 0){
      from.path ? next({name: from.name}) : next('*')
    }
    next();
});

  {
    path: '/404',
    name: 'PageNotFound',
    component: PageNotFound,
  },
  {
    path:'*',
    redirect:'/404'
   }