elementui的el-image组件添加previewSrcList属性在手机上预览如何实现双指放大缩小？

Question

<div class="demo-image__preview">
  <el-image 
    style="width: 100px; height: 100px"
    :src="url" 
    :preview-src-list="srcList">
  </el-image>
</div>

<script>
  export default {
    data() {
      return {
        url: 'https://fuss10.elemecdn.com/e/5d/4a731a90594a4af544c0c25941171jpeg.jpeg',
        srcList: [
          'https://fuss10.elemecdn.com/8/27/f01c15bb73e1ef3793e64e6b7bbccjpeg.jpeg',
          'https://fuss10.elemecdn.com/1/8e/aeffeb4de74e2fde4bd74fc7b4486jpeg.jpeg'
        ]
      }
    }
  }
</script>

如果手机上预览，实现双指放大缩小，代码该如何去改？