列表无限滚动

/**
 * 列表无限滚动
 * @return {[type]} [description]
 */
initAutoScroll() {
  let $listWrapper = this.$template.find('.list-wrapper');
  let $list = $listWrapper.find('>ul');
  $list.clone().appendTo($listWrapper);
  this.scrollInterval = setInterval(() => {
    if($listWrapper.height() > $list.height()) {
      $list.next().remove();
      clearInterval(this.scrollInterval);
      return false;
    }
    let marginTop = Number.parseInt($list.css('marginTop'));
    if(Math.abs(marginTop) >= $list.height()) {
      marginTop = Number.parseInt($listWrapper.css('marginTop'));
    }
    $list.css({ marginTop: `${marginTop - 1}px` });
  }, 50);
}