[I] [Feature] valueFormatter 回调函数的参数增加 seriesIndex [echarts]

Thu, 19 Sep 2024 04:07:59 -0700 


kkkisme opened a new issue, #20358:
URL: https://github.com/apache/echarts/issues/20358

   ### What problem does this feature solve?
   
   之前有类似的feature
   #18997
   但是dataIndex似乎太鸡肋了，同一series的数据展示的格式大概率是相同的，用不到dataIndex。
   
   而用到seriesIndex的场景会比较多，例如：
   
![image](https://github.com/user-attachments/assets/3594cbf7-fb5d-43f9-8d7e-83dc586bd67f)
   这里的需求是区分不同series：**金额**、**占比**需要展示成**数字**或**百分比**
   
   
![image](https://github.com/user-attachments/assets/ad102e48-8261-44c4-a503-f15fcff722fe)
   
   
   ### What does the proposed API look like?
   
   ``` ts
   valueFormatter: (value: string | number, dataIndex: number, params: 
SeriesModel) => string
   ```


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