appendData报undefined？？

[JedidiahY]

Version

4.1.0-rc.0

Reproduction link

https://www.echartsjs.com/zh/api.html#echartsInstance.appendData

Steps to reproduce

appendData报undefined？？

What is expected?

实现增量渲染技术

What is actually happening?

找不到appendData方法

---

"echarts": "^4.1.0",

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[Ovilia]

Hello. Please provide the code.