I ran into the same problem. I downloaded the 'popper.min.js' file from the CDN on the bootstrap website. ... <看更多>

A free, fast, and reliable CDN for @popperjs/core. Tooltip and Popover Positioning Engine. ... <看更多>

GitHub - popperjs/popper-core: Positioning tooltips and popovers is difficult. ... Please use a versioning management system like a CDN or npm/Yarn. ... <看更多>

2. CDN. <script src="https://unpkg.com/popper.js@ ... ... <看更多>

... <看更多>