zpf96126 commented on issue #7480: iframe中echart无法获取问题 URL: https://github.com/apache/incubator-echarts/issues/7480#issuecomment-519332490 同问，不过我是在绘制出echarts图表后，重新打开iframe ,然后使用var demo=echarts.getInstanceByDom(parent.document.getElementById("chart0"))去获取图表实例，然后提示demo 为Undefined
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