Bootstrap_栅格系统_注意事项
栅格系统_注意事项：
1.一行中如果格子数目超过12，则超出部分自动换行
2.栅格类属性可以向上兼容。栅格类适用于与屏幕宽度大于或等于分界点大小的设备
3.如果真实设备宽度小于了设置栅格类属性的设备代码的最小值，会一个元素沾满一整行
Bootstrap_全局CSS样式_按钮&图片
全局CSS样式
按钮：class="btn btn-default"
图片
img-responsive:在任意尺寸都占100%
<img src="..." alt="..." class="img-rounded">：方形
<img src="..." alt="..." class="img-circle"> 椭圆形
<img src="..." alt="..." class="img-thumbnail">：相框形
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
<title>Bootstrap HelloWorld</title>
<!-- Bootstrap -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- jQuery (Bootstrap 的所有 JavaScript 插件都依赖 jQuery，所以必须放在前边) -->
<script src="js/jquery-3.2.1.min.js"></script>
<!-- 加载 Bootstrap 的所有 JavaScript 插件。你也可以根据需要只加载单个插件。 -->
<script src="js/bootstrap.min.js"></script>
<style>
</style>
</head>
<body>
<a class="btn btn-default" href="#" >Link</a>
<button class="btn btn-default" type="submit">Button</button>
<input class="btn btn-default" type="button" value="Input">
<input class="btn btn-default" type="submit" value="Submit">
<br>
<!-- Standard button -->
<button type="button" class="btn btn-default">（默认样式）Default</button>
<!-- Provides extra visual weight and identifies the primary action in a set of buttons -->
<button type="button" class="btn btn-primary">（首选项）Primary</button>
<!-- Indicates a successful or positive action -->
<button type="button" class="btn btn-success">（成功）Success</button>
<!-- Contextual button for informational alert messages -->
<button type="button" class="btn btn-info">（一般信息）Info</button>
<!-- Indicates caution should be taken with this action -->
<button type="button" class="btn btn-warning">（警告）Warning</button>
<!-- Indicates a dangerous or potentially negative action -->
<button type="button" class="btn btn-danger">（危险）Danger</button>
<!-- Deemphasize a button by making it look like a link while maintaining button behavior -->
<button type="button" class="btn btn-link">（链接）Link</button>
<br>
<img src="img/a.jpg" class="img-responsive">
<img src="img/a.jpg" class="img-responsive img-rounded">
<img src="img/a.jpg" class="img-responsive img-circle">
<img src="img/a.jpg" class="img-responsive img-thumbnail">
</body>
</html>
标签：样式,Bootstrap,栅格,按钮,注意事项,CSS From： https://www.cnblogs.com/x3449/p/16927601.html