下载图片时,使用了getDataURL获取base64格式,在赋值给img的src上,折线图的线条不显示

原来的图
![_20180914145701](https://user-images.githubusercontent.com/28383371/45535025-a4a43a00-b82f-11e8-817e-5ff3fad5da7a.png)

下载后的图
![_20180914145733](https://user-images.githubusercontent.com/28383371/45535034-ac63de80-b82f-11e8-9354-f025ffc6fa02.png)







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https://github.com/apache/incubator-echarts/issues/9073 ]
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