jQuery realizes the scrolling effect of table row data

<div class="box">
  <div class="box-header">
    <div class="col">Test 1</div>
    <div class="col">Test 2</div>
    <div class="col">Test 3</div>
    <div class="col">Test 4</div>
  </div>
  <div id="font-scroll">
    <div class="box-body">
      <div class="row">
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
      </div>
      <div class="row">
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
      </div>
      <div class="row">
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
      </div>
      <div class="row">
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
      </div>
      <div class="row">
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
      </div>
      <div class="row">
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
      </div>
      <div class="row">
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
      </div>
      <div class="row">
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
      </div>
      <div class="row">
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
        <div class="col">Test text</div>
      </div>
    </div>
  </div>
</div>

.box {
      width: 400px;
      text-align: center;
      font-size: 14px;
      border: 1px solid rgba(0, 0, 0, .3);
    }

    .box .box-header {
      display: flex;
      justify-content: space-evenly;
    }

    .box-body .row {
      display: flex;
      justify-content: space-evenly;
    }

    .box-header,
    .box-body .row {
      border-bottom: 1px dashed #404040;
    }

    .box .col {
      padding: 10px 0 10px 0;
    }

    .box .col:nth-child(1) {
      width: 80px;
    }

    .box .col:nth-child(2) {
      width: 60px;
    }

    .box .col:nth-child(3) {
      width: 80px;
    }

    .box .col:nth-child(4) {
      width: 60px;
    }

    /* Content scrolling */

    #font-scroll {
      /* Content scrolling visible height*/
      height: 199px;
      overflow: hidden;
    }

(function ($) {
  $.fn.FontScroll = function (options) {
    let d = { time: 1000 }
    $.extend(d, options);

    // The div parent box that needs to be scrolled let box = this[0]
    // scroll interval let _time = d.time

    // This method is only suitable for the case where the height of each row of data is the same // // The height of each scroll (usually the height of a data line)
    // let _contentChildHeight = box.children[0].children[0].offsetHeight
    // // The total scroll height, that is, the total height of the content (the total height of all data)
    // let _contentTotalHeight = _contentChildHeight * box.children[0].children.length

    // This method is suitable for all cases, including the case where the height of each row of data is different // Get all row elements let all_row_el = box.children[0].children
    // Total row height let _contentTotalHeight = 0
    // The superposition height of each row of data and the height of all previous rows let _contentChildHeight = []
    for (let i in all_row_el) {
      if ((new RegExp("^\\d+$")).test(i)) {
        _itemHeight = all_row_el[i].offsetHeight
        _contentTotalHeight += _itemHeight
        i == 0 ? _contentChildHeight.push(_itemHeight) : _contentChildHeight.push(_contentChildHeight[i - 1] + _itemHeight)
      }
    }

    // The div subbox that needs to be scrolled let child1 = this.children('.box-body')
    // Clone the scrolling div child box // Clone method 1 // let child1 = this.children('.box-body')[0]
    // let child2 = this.children('.box-body')[1]
    // child2.innerHTML = child1.innerHTML
    // Clone method 2 if ((box.offsetHeight + 5) < _contentTotalHeight) {
      // If the data does not reach a certain height, the scrolling effect will not be performed child1.clone().insertAfter(child1)
      /*Start the timer*/
      let timer = setInterval(autoScrollLine, 30)
      /*Single line scroll up effect*/
      function autoScrollLine() {
        /* Determine whether the scrolling content has been scrolled, if it has been scrolled, reset the scroll value to 0
        Otherwise, scroll up 1px every 30 milliseconds*/
        if (box.scrollTop >= _contentTotalHeight) {
          box.scrollTop = 0;
        } else {
          box.scrollTop++;
        }
        /*Stop the timer when the scrolling distance is exactly the height of a data line.
        Restart the timer after _time to achieve the data scrolling effect*/
        if (_contentChildHeight.indexOf(box.scrollTop) >= 0) {
          clearInterval(timer)
          setTimeout(() => {
            timer = setInterval(autoScrollLine, 30)
          }, _time)
        }
      }
    }
  }
})(jQuery);

$('#font-scroll').FontScroll({ time: 1000 });