I'm trying to implement fallback.js in a webapp me and my team are writing but bounced upon some issues. Loading over CDN works fine and falling back to local .js files when CDN is offline works too.

使用bootstrap时提示缺少popper.js，现在上传popper.min.js，亲测可用 中的网址另存为，或者直接复制网页代码另存为，map文件就是 ...