https://getbootstrap.com/docs/4.6/getting-started/introduction/
1) 우상단에 사용하고자 하는 버전을 선택
2) BootStrap-Getting Started-CSS, JS목차의 link, script파일들을
내가 생성한 vue파일-public-index.html에 붙여넣기
4점대 버전
CSS
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css" integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous">
JS
<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-Fy6S3B9q64WdZWQUiU+q4/2Lc9npb8tCaSX9FK7E8HnRr0Jz8D6OP9dO5Vg3Q9ct" crossorigin="anonymous"></script>
//5버전
npm install bootstrap@5
//4버전
npm install bootstrap@4 jquery popper.js
import 'bootstrap'
import 'bootstrap/dist/css/bootstrap.min.css'