WangSuwen opened a new 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
 
 
   ### Version
   4.1.0-release
   
   ### Steps to reproduce
   无
   
   ### What is expected?
   能够同时正常渲染多个 折线图
   
   ### What is actually happening?
   不能正常渲染
   
   ---
   我们现在 是在 
移动端用Vue框架实现的H5页面,现在一个页面有两个Tab,每个Tab需要同时渲染多个折线图,然后在来回切换Tab时,会报错:TypeError:null 
is not an object(evaluating 'this.ctx.dpr=this.dpr') 。 
导致折线图无法渲染。麻烦官方帮忙指导一下O(∩_∩)O谢谢。目前比较紧急🙏。
   
   <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
   

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