lihu
It's too difficult to use some browser specific APIs.
`getVisibleRange()`?
From and to are KLineData array index, only need to get the current data through `getDataList`.
可以用自定义指标覆盖原有的k线柱实现
Custom indicator can do it.
不会额外新增api，你可以用现有api组合实现
@Daic115 Thank you very much for submitting the PR. This is a very great extension, but considering the size management of the core library, I suggest submitting it to this...
The indicator calculation has been changed to asynchronous, but it seems that there are indeed some problems now.
设置不了，自动计算的