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### One-line summary [问题简述]
做了一个通过click事件获取目标散点来改变它的itemStyle
现在有个问题
如何能够实现活动散点置于最上面不被其他散点遮挡

![1536283741 
1](https://user-images.githubusercontent.com/30069830/45194837-5fa86280-b287-11e8-82b5-951a6c1687de.jpg)


[ Full content available at: 
https://github.com/apache/incubator-echarts/issues/9029 ]
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