export default {
 name: 'App',
 provide(){
 return{
  reload:this.reload
 }
 },
 data(){
 return {
  isRouterAlive:true,
 }
 },
 //監(jiān)聽器
 watch: {
 // 方法1
 '$route' (to, from) { //監(jiān)聽路由是否變化
  // console.log(999)
  if(to.path == "/"){ //跳轉(zhuǎn)到哪個頁面
  location.reload()
  }
 },
 },
 methods:{
 reload(){
  this.isRouterAlive = false;
  this.$nextTick(function () {
  this.isRouterAlive = true
  });
 },
 },
}

    //監(jiān)視如果頁面離開
    created() {
      window.addEventListener('beforeunload', this.updateHandler)
    },
    beforeDestroy() {
      this.finalItemDetail(); // 自己要進(jìn)行的操作
    },
    destroyed() {
      window.removeEventListener('beforeunload', this.updateHandler)
    },

      updateHandler() {
        this.finalItemDetail()
      },
      finalItemDetail() {
        console.log('刷新或關(guān)閉');
      },

    watch: {
      // 如果路由有變化，會再次執(zhí)行clear方法
      // "$route": "clear",
      $route(to , from){
        console.log( to.path, from.path );
        this.clear(to.path);
      }
    },

      clear(path) {
        if(path!="/item/item01/evaluate")
          console.log("從這個頁面離開了");
        this. active=0;
      },