Bootstrap官网：https://v4.bootcss.com/
1、下载Bootstrap文件（控制台）
npm install bootstrap
2、下载Bootstrap图标库（控制台）
npm i bootstrap-icons
3、临时使用Bootstrap文件（导入即可）
<!-- CSS --> <link href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-p1KAotb3W9ndluCsqePPYnjRm3c6abdnIjo0tQwYUv83VsbsYd43RuofnFAaDo0E" crossorigin="anonymous"> <!-- jQuery and JavaScript Bundle with Popper --> <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@4.6.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-E5Sj1saJVFNzWWK3YIJB4LEDEEVEGaOdfmCprPDkfWUo+xkb6Ep52Q1TMEtgcFwi" crossorigin="anonymous"></script>
