


.btn-default??The default style of the button;
.btn-primary??The preferred style of the button;
.btn-success??The success style of the button ;
.btn-info?? General information style of the button; '
.btn-warning?? warning style of the button;
.btn-danger?? button Dangerous style;
.btn-link?? button link style;
.btn-lg?? large button style;
.btn-sm?? small Button style;
.btn-xs?? Extra small button style;
.btn-block?? Set the button to fill the parent element;
.active?? Set the button to the active state;
.disabled?? Set the button to the disabled state;
.img-circle?? Set the image to be circular;
.img- rounded?? Set the image to rounded corners;
.img-thumbnail?? Set the image to a square shape;
.img-responsive?? Add responsiveness to the image;
<meta charset="UTF-8"> <meta name="viewport" content="width=device-width,initial-scale=1"> <title>CSS全局样式_栅格系统</title> <link rel="stylesheet" href="bootstrap.min.css" type="text/css"><div class="container"> <p> <button type="button" class="btn btn-default">(默认样式)Default</button> <button type="button" class="btn btn-primary">(首选项)Primary</button> <button type="button" class="btn btn-success">(成功)Success</button> <button type="button" class="btn btn-info">(一般信息)Info</button> <button type="button" class="btn btn-warning">(警告)Warning</button> <button type="button" class="btn btn-danger">(危险)Danger</button> <button type="button" class="btn btn-link">(链接)Link</button> </p> <p> <button type="button" class="btn btn-success btn-lg" disabled>success</button> <button type="button" class="btn btn-success active">success</button> <button type="button" class="btn btn-success btn-sm">success</button> <button type="button" class="btn btn-success btn-xs">success</button> </p> <button type="button" class="btn btn-success btn-block">success</button> <a href="#" class="btn btn-primary btn-block">登录</a> <input class="btn btn-primary btn-block" value="提交"> <img class="img-circle lazy" src="/static/imghwm/default1.png" data-src="images/g.jpg" alt="girl"> <img class="img-rounded lazy" src="/static/imghwm/default1.png" data-src="images/g.jpg" alt="girl"> <img class="img-thumbnail lazy" src="/static/imghwm/default1.png" data-src="images/g.jpg" alt="girl"> <img class="img-responsive lazy" src="/static/imghwm/default1.png" data-src="images/937654.jpg" alt="girl"> </div>
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Setting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.

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