methods: { 
      // 增加閱讀人數(shù)
      setpeople(){
        console.log('定時(shí)器開啟');
        // overTimer 這個(gè)值可以寫在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)
      },
      // 修改閱讀人數(shù)
      setpeo(){
        let params = `artical_peo=${this.artical_peo}&&id=${this.id}`
        this.axios.put('/read',params).then(res=>{
          // console.log(res);
        })
      },

        // 超時(shí)定時(shí)器
        overTimer: 15000,
        sname:''
      }
    },
    // 監(jiān)測(cè)路由跳轉(zhuǎn)
    beforeRouteEnter (to, from, next) {
       console.log('要跳到的頁(yè)面',to.name)
       console.log('從那個(gè)頁(yè)面跳過(guò)來(lái)',from.name)
      //  console.log(next)
      next(vm =>{
        //這里把獲取到的from.name給到data里面定義的sname
        vm.sname = from.name
        // console.log(vm.sname);
      });
    },

mounted () {
      // 判斷當(dāng)前跳轉(zhuǎn)過(guò)來(lái)的頁(yè)面如果是 scang 就不啟動(dòng)定時(shí)器
      if(this.sname == 'Scang'){
        //清除定時(shí)器
        clearTimeout(this.setpeople)
      }else{
        // 開啟定時(shí)器 當(dāng)點(diǎn)進(jìn)來(lái)瀏覽夠15秒后閱讀量加一
        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) => {
? // ?從其他地方訪問(wèn)是否有這個(gè)地址
? ? if(to.matched.length == 0){
? ? ? from.path ? next({name: from.name}) : next('*')
? ? }
? ? next();
});

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