side9527 commented on issue #9256: echarts 4.0 树缩放 后收拢根节点会玩失踪 URL: https://github.com/apache/incubator-echarts/issues/9256#issuecomment-432941892 我之前也遇到这个问题，后来的解决方法是，点击节点的时候根据chartChild._chartsViews[0]._data._graphicEls.length 来判断点击的节点是否为根节点（length < 3即为根节点），如果是根节点就使用chartChild.setOption(chartChild.getOption())重新产开，也算是不让他收起根节点吧，别的方法找了很多没找到，就先暂时用的这个
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