文档中的代码示例能否添加按需加载的代码？ #3810

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

想要按需使用的话，每一次都不知道具体该引入哪些动画、哪些Label；

What does the proposed API look like?

能否跟新版的 echarts 一样在示例代码里面会有 JS、TS以及按需使用的代码。

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