官网例子运行不了

[724382762]

Version

4.2.1-rc.3

Steps to reproduce

第一次使用Echarts，用例是官网上的抄的，发现运行不了

What is expected?

按官网上的效果显示

What is actually happening?

提示出错，没有图像显示

[echarts-bot]

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