Ovilia commented on issue #12083: Echarts关系图graph是否支持单向 URL: https://github.com/apache/incubator-echarts/issues/12083#issuecomment-575958326 通过[监听移动到数据的事件](https://echarts.apache.org/en/api.html#events.Mouse%20events.mouseover)，再用 `setOption` 改变内容（去掉某些箭头）。
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