BootStrap笔记-按钮相关
程序运行截图如下：
源码如下：
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>CN_TEST1</title><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><!-- bootstrap css核心文件--><link rel="stylesheet" href="bootstrap-4.4.1-dist/css/bootstrap.min.css"><!-- bootstrap使用到了jquery，需要提前引用--><script src="js/jquery-3.5.1.min.js"></script><!-- 弹窗、提示、下拉菜单--><script src="bootstrap-4.4.1-dist/js/bootstrap.bundle.js"></script><!-- bootstrap核心文件--><script src="bootstrap-4.4.1-dist/js/bootstrap.min.js"></script></head><body><div class="container-fluid"><button type="button" class="btn">btn按钮</button><button type="button" class="btn btn-primary">btn-primary按钮</button><button type="button" class="btn btn-secondary">btn-secondary按钮</button><button type="button" class="btn btn-success">btn-success按钮</button><button type="button" class="btn btn-info">btn-info按钮</button><button type="button" class="btn btn-warning">btn-warning按钮</button><button type="button" class="btn btn-dark">btn-dark按钮</button><button type="button" class="btn btn-light">btn-light按钮</button><button type="button" class="btn btn-link">btn-link按钮</button><br/><button type="button" class="btn">btn按钮</button><button type="button" class="btn btn-outline-primary">btn-primary按钮</button><button type="button" class="btn btn-outline-secondary">btn-secondary按钮</button><button type="button" class="btn btn-outline-success">btn-success按钮</button><button type="button" class="btn btn-outline-info">btn-info按钮</button><button type="button" class="btn btn-outline-warning">btn-warning按钮</button><button type="button" class="btn btn-outline-dark">btn-dark按钮</button><button type="button" class="btn btn-outline-light">btn-light按钮</button><button type="button" class="btn btn-outline-link">btn-link按钮</button><br/><button type="button" class="btn">btn按钮</button><button type="button" class="btn btn-outline-primary btn-lg">btn-primary按钮</button><button type="button" class="btn btn-outline-secondary btn-lg">btn-secondary按钮</button><button type="button" class="btn btn-outline-success btn-lg">btn-success按钮</button><button type="button" class="btn btn-outline-info btn-lg">btn-info按钮</button><button type="button" class="btn btn-outline-warning btn-lg">btn-warning按钮</button><button type="button" class="btn btn-outline-dark btn-lg">btn-dark按钮</button><button type="button" class="btn btn-outline-light btn-lg">btn-light按钮</button><button type="button" class="btn btn-outline-link btn-lg">btn-link按钮</button><br/><button type="button" class="btn">btn按钮</button><button type="button" class="btn btn-outline-primary btn-lg btn-block">btn-primary按钮</button><button type="button" class="btn btn-outline-secondary btn-lg btn-block">btn-secondary按钮</button><button type="button" class="btn btn-outline-success btn-lg btn-block">btn-success按钮</button><button type="button" class="btn btn-outline-info btn-lg btn-block">btn-info按钮</button><button type="button" class="btn btn-outline-warning btn-lg btn-block">btn-warning按钮</button><button type="button" class="btn btn-outline-dark btn-lg btn-block">btn-dark按钮</button><button type="button" class="btn btn-outline-light btn-lg btn-block">btn-light按钮</button><button type="button" class="btn btn-outline-link btn-lg btn-block">btn-link按钮</button><br/><button type="button" class="btn btn-outline-primary btn-lg btn-block active">btn-primary按钮</button><button type="button" class="btn btn-outline-secondary btn-lg btn-block" disabled>btn-secondary按钮</button><br/><button class="btn btn-primary"><span class="spinner-border spinner-border-sm"></span></button><button class="btn btn-primary"><span class="spinner-border spinner-border-sm"></span>Loading...</button><button class="btn btn-primary"><span class="spinner-grow spinner-grow-sm"></span>Loading...</button></div></body></html>
解释：
①span中的一个类是spinner-border和sprnner-graw分别代表的效果：
②使用BootStrap的button属性时，要用btn类，后面再接各种不同的类样式。
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