Ovilia commented on issue #10674: IOS 一个页面渲染多个 折线图时报错：TypeError:null is not an object(evaluating 'this.ctx.dpr=this.dpr') URL: https://github.com/apache/incubator-echarts/issues/10674#issuecomment-502518040 这可能是因为找不到 DOM 节点引起的。 可以试试离开 tab 的时候，dispose 掉，chart 实例设为 null；进入 tab 的时候重新 init 图表。
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