[Bug Report] vue的cdn失效，文档中的demo无法在codepen里面运行
Open
- Dominant language
- Vue
- Stars
- 54k
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Description
### Element UI version
2.15.9
### Vue version
2.7.7
### Reproduction Link
https://codepen.io/pen?&prefill_data_id=15c22155-b75b-42e8-8a6d-8404842be363
### Steps to reproduce
1. 选择一个组件
2. 点击在线运行
3. 你会发现codepen里面一片空白，把vue的地址单独拿出来运行，cdn提示地址失效
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