我修改了zrender的代码。可以把图形的背景色都透明
也可以通过echart传个颜色过来进行拓展
// Path.js  
![image](https://user-images.githubusercontent.com/22208613/44460198-bcc4d700-a63e-11e8-82a6-a1239f6025d5.png)


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