BootStrap官网

http://www.bootcss.com下载bootstrap源码

https://github-production-release-asset-2e65be.s3.amazonaws.com/2126244/9c5b6db6-5245-11e6-800b-b1e5008b1179?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20190408%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20190408T112201Z&X-Amz-Expires=300&X-Amz-Signature=5a1bcd0f0fe3f09bada9baea90a2413339fbe7586102e403d3608c3c51cc8bdb&X-Amz-SignedHeaders=host&actor_id=0&response-content-disposition=attachment%3B%20filename%3Dbootstrap-3.3.7-dist.zip&response-content-type=application%2Foctet-stream下载jQuery源码在新建的HTML里面引用BootStrap与jQuery

<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> //bootstrap引用位置 <link rel="stylesheet" href="bootstrap-3.3.7-dist/css/bootstrap.css"> <link rel="stylesheet" href="bootstrap-3.3.7-dist/css/bootstrap-theme.css"> <script src="jquery3.js"></script> <script src="bootstrap-3.3.7-dist/js/bootstrap.js"></script></head><body> //从bootstrap官网复制过来的代码 <div class="dropdown"> <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true"> Dropdown <span class="caret"></span> </button> <ul class="dropdown-menu" aria-labelledby="dropdownMenu1"> <li><a href="#">Action</a></li> <li><a href="#">Another action</a></li> <li><a href="#">Something else here</a></li> <li role="separator" class="divider"></li> <li><a href="#">Separated link</a></li> </ul> </div></body></html>

展示