plainheart commented on issue #19778:
URL: https://github.com/apache/echarts/issues/19778#issuecomment-2027043754

   可以尝试如下两种方式:
   
   1、CSS 选择器
   
   ```css
   canvas[data-zr-dom-id="zr_你的canvas序号"]
   ```
   
   2、通过 API 获取到 Canvas Layer 对应的 DOM 元素
   
   ```js
   myChart.getZr().painter.getLayer(Canvas序号).dom.style.zIndex = xxx
   ```
   


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