js realizes the dynamic loading of data by waterfall flow bottoming out

// onScrollEvent scroll bar event <div class="box" ref="box" @mousewheel="onScrollEvent">
    //The content of each block start
      <div class="boxItemStyle" v-for="(userTag, i) in dataSource" :key="i" ref="boxItemStyle">
        <a-tag class="moreStyle" @click="more(userTag.primaryParam)"> More></a-tag>
        <div v-for="item in userTag.userTag" :key="item.code">
          <p>
            {{ item.name }}:
            {{ item.value }}
          </p>
        </div>
      </div>
      //Contents in each block end
</div>

waterFall() {
  // Subtract the width of the margin var pageWidth = this.$refs.box.offsetWidth - 200
      var columns = 4; //Define a row with 4 columns var itemWidth = parseInt(pageWidth / columns);
      var arr = [];
      var nodes = document.getElementsByClassName("boxItemStyle")
      setTimeout(() => {
        //var node1 = Array.from(nodes)
       // var node2 = Array.prototype.slice.call(nodes)
        for (var i = 0; i < nodes.length; i++) {
          nodes[i].style.width = itemWidth + "px"
          if (i < columns) {
            nodes[i].style.width = itemWidth + "px"
            nodes[i].style.left = itemWidth * i + i * 50 + "px"
            nodes[i].style.top = 0
            arr.push(nodes[i].offsetHeight);
          } else {
            // Find the minimum height in the array and its index var minHeight = arr[0];
            var index = 0;
            for (var j = 0; j < arr.length; j++) {
              if (minHeight > arr[j]) {
                minHeight = arr[j];
                index = j;
              }
            }
            nodes[i].style.top = arr[index] + 30 + "px",
              nodes[i].style.left = nodes[index].offsetLeft + 'px';
            // Modify the height of the minimum column // The height of the minimum column = the current height + the height of the spliced ​​column arr[index] = arr[index] + nodes[i].offsetHeight + 30; // Set a distance of 30 }
        }
      }, 1000)
    },

onScrollEvent () {
      if (
        this.isScroll &&
        this.$refs.box.scrollHeight - this.$refs.box.scrollTop - this.$refs.box.clientHeight <= 0
      ) {
        this.loading = true
        if (this.ipagination.current == 1) {
          this.ipagination.current += 1
        }
        let param = {}
        param['pageNo'] = this.ipagination.current
        param['pageSize'] = this.ipagination.pageSize
        param['portraitId'] = this.portraitId
        postAction(this.url.list, { ...param }).then((res) => {
          this.loading = false
          if (res.success) {
            this.isScroll = res.records
            this.dataSource = this.dataSource.concat(res.result.records || res.result)
            this.waterFall();
          }
        })
        this.ipagination.current++
      }
    },