li-jia-nan opened a new issue, #20579:
URL: https://github.com/apache/echarts/issues/20579
### What problem does this feature solve?
`tooltip.formatter` 方法接受一个 `params` 参数，当 `tooltip.trigger = item` 的，`params`
是当前 hover 的 series data，当 `tooltip.trigger = axis` 时，`params` 是一个数组，包含所有的
series data
我需要在 `tooltip.trigger = item` 的时候，在 tooltip 中也展示所有的 series 信息，所以我希望
`tooltip.trigger = item` 的，也可以获取到所有的 series data
---
The `tooltip.formatter` method accepts a params. When `tooltip.trigger =
item`, `params` is the series data of the current hover. When `tooltip.trigger
= axis`, `params` is an array containing all series data.
I need to display all series info in the tooltip when `tooltip.trigger =
item`, so I hope to get all series data when `tooltip.trigger = item`.
### What does the proposed API look like?
当 `trigger = 'item'` 时可以新增一个 context 参数：
```ts
tooltip: {
trigger: 'item',
formatter: (params, context) => {
console.log(context);
}
}
```
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