[Feature] 基于appendData可以海量增量更新数据，目前还需要海量覆盖更新数据

[duyu123]

What problem does this feature solve?

目前数据源是后端用websocket提供，1ms会有新数据推送。使用setOption会使页面上刻度闪烁，放大缩小旋转角度都特别卡顿。使用appendData是增量更新，显示异常。所以需要一个API，单独渲染指定series，海量实时更新数据

What does the proposed API look like?

coverData

[echarts-bot]

@duyu123 It seems you are not using English, I've helped translate the content automatically. To make your issue understood by more people and get helped, we'd like to suggest using English next time. 🤗

TRANSLATED

TITLE

[Feature] Based on appendData, you can update a large number of incremental data, and currently you need to overwrite and update data in large quantities