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Uncaught Error: Bootstrap dropdown require Popper.js
Bootstrap 4 Dropdown Menu (14 Examples with Code)
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Bootstrap dropdown require Popper.js (https://popper.js.org) · Issue #23381 · twbs/bootstrap · GitHub
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jquery - Dropdown (Bootstrap 4 popper.js) links not working in when the site is converted to wordpress but works fine in the HTML version of the website - Stack Overflow
解决Bootstrap dropdown require Popper.js的问题- AssassinCCC - 博客园
解决Error：Bootstrap dropdown require Popper.js (https://popper.js .org)_freedom1993的博客-CSDN博客
