code: function indicator () {
        let indicatorBox = createTagWithClass('mip-carousel-indicatorbox')
        let indicatorBoxWrap = createTagWithClass('mip-carousel-indicatorBoxwrap', 'p')
        let indicatorNow = createTagWithClass('mip-carousel-indicatornow', 'span')
        let indicatorAllNum = createTagWithClass('', 'span')
        indicatorAllNum.innerHTML = '/' + (childNum - 2)
        indicatorNow.innerHTML = imgIndex
        indicatorBoxWrap.appendChild(indicatorNow)
        indicatorBoxWrap.appendChild(indicatorAllNum)
        indicatorBox.appendChild(indicatorBoxWrap)
        ele.appendChild(indicatorBox)
      }
docs: 创建指示器