該框架已經幫你寫好了很多頁面樣式，你如果需要使用，只需要下載它對應文件，之后直接cv拷貝即可；
宗旨：在使用Bootstrap的時候所有的頁面樣式都只需要你通過class來調節即可；
什么是響應式布局？比如瀏覽器窗口大小的調節，各標簽需自適應調節大小，以至於整體布局不會丑陋無比；
版本選擇建議使用v3(最好不要用最新的)版本(用於生產環境的 Bootstrap)：https://v3.bootcss.com/
不下載還可以直接在script中引用cdn鏈接，如：
<link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/js/bootstrap.min.js"></script>
建議前期下載使用，因為這樣pycharm會有語法提示
bootstrap解壓后，會有css和fonts及js三個目錄，css目錄可只留一個bootstrap.min.css文件；fonts目錄有幾個文件留幾個文件，一個都
不要刪除；js目錄可只留一個bootstrap.min.js文件；
注意：bootstrap的js代碼是依賴於jQuery的，也就意味着你在使用bootstrap動態效果的時候，一定要先導入jQuery；
CV大法：打開開發者工具，找到其對應html，對其html右鍵copy/copy outerhtml
舉例：Bootstrap官網的實例精選，找到其輪播圖，打開開發者工具查看其html，然后進行復制粘貼操作，這樣輪播圖的功能就已經完成了；
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <meta name="viewport" content="width=device-width, initial-scale=1 user-scalable=no"> <link rel="stylesheet" href="bootstrap-3.4.1-dist/css/bootstrap.min.css"> <script src="../js/jquery-3.3.1.min.js"></script> <script src="bootstrap-3.4.1-dist/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <div class="row"> <div class="col-md-8 col-md-offset-2"> <div id="carousel-example-generic" class="carousel slide" data-ride="carousel"> <ol class="carousel-indicators"> <li data-target="#carousel-example-generic" data-slide-to="0" class=""></li> <li data-target="#carousel-example-generic" data-slide-to="1" class="active"></li> <li data-target="#carousel-example-generic" data-slide-to="2" class=""></li> </ol> <div class="carousel-inner" role="listbox"> <div class="item"> <img data-src="holder.js/1140x500/auto/#777:#555/text:First slide" alt="First slide [1140x500]" src="data:image/svg+xml;base64,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" data-holder-rendered="true"> </div> <div class="item active"> <img data-src="holder.js/1140x500/auto/#666:#444/text:Second slide" alt="Second slide [1140x500]" src="data:image/svg+xml;base64,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" data-holder-rendered="true"> </div> <div class="item"> <img data-src="holder.js/1140x500/auto/#555:#333/text:Third slide" alt="Third slide [1140x500]" src="data:image/svg+xml;base64,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" data-holder-rendered="true"> </div> </div> <a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev"> <span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span> <span class="sr-only">Previous</span> </a> <a class="right carousel-control" href="#carousel-example-generic" role="button" data-slide="next"> <span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span> <span class="sr-only">Next</span> </a> </div> </div> </div> </div> </body> </html>