25.pc端下拉加载IntersectionObserver

  beforeDestroy() {
    if (this.IntersectionObserver) {
      this.IntersectionObserver.disconnect();
    }
  },
  methods: {
    ObserverCallback(entrys) {
      entrys.forEach(entry => {
        console.log(44, entrys);
        if (!entry.isIntersecting) return;
        //加载更多 ,请求
      });
    },
    addObserver() {
      try {
        let rootDom = document.getElementById('msgInfoPC');
        let lMoreDom = document.querySelector('.ynpc-load-more');
        if (!rootDom || !lMoreDom) return;
        setTimeout(() => {
          let options = {
            root: rootDom,
            rootMargin: '0px 0px 50px 0px',
            thresholds: 0
          };
          this.IntersectionObserver = new IntersectionObserver(this.ObserverCallback, options);
          //监听最底部的loadmore是否出现
          this.IntersectionObserver.observe(lMoreDom);
          console.log('lsit');
        }, 300);
      } catch (error) {}
    },
    handleMsgShowInfoByPC(obj) {
      this.getNotificationsType(obj.type);
      setTimeout(() => {
        this.setNotiRead(obj.type);
      }, 1000);
    },
  }