dingww removed a comment 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-518586330 找到解决办法了！ 给树图的Echarts组件加一个点击事件，当event.dataIndex === 1时，初始化一个Echarts实例 myCharts，然后将myChart._chartsViews[0].group.position 重置为 [0, 0]就可以了。 亲测有效。
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