Here’s a list of CDN that operate in China and seem to be well maintained/stable.
Baidu CDN http://cdn.code.baidu.com/
Boot CDN http://www.bootcdn.cn/
Sina CDN http://lib.sinaapp.com/
Upai CDN http://jscdn.upai.com/
CDN JS https://cdnjs.com/
StaticFile https://www.staticfile.org/
This website offers clones of google fonts and public files for China.
http://libs.useso.com/
They mainly offer the standard JS libraries and frameworks like jQuery, Angular, Vue JS, React, etc.