Bootstrap 标签样式，代码如下：
<!DOCTYPE html><html><head> <title>Bootstrap 实例 - 标签的变体</title> <style type="text/css"> .label{display:inline;padding:.2em .6em .3em;font-size:75%;font-weight:bold;line-height:1;color:#fff;text-align:center;white-space:nowrap;vertical-align:baseline;border-radius:.25em} .label[href]:hover,.label[href]:focus{color:#fff;text-decoration:none;cursor:pointer} .label:empty{display:none} .label-default{background-color:#999} .label-default[href]:hover,.label-default[href]:focus{background-color:#808080} .label-primary{background-color:#428bca} .label-primary[href]:hover,.label-primary[href]:focus{background-color:#3071a9} .label-success{background-color:#5cb85c} .label-success[href]:hover,.label-success[href]:focus{background-color:#449d44} .label-info{background-color:#5bc0de} .label-info[href]:hover,.label-info[href]:focus{background-color:#31b0d5} .label-warning{background-color:#f0ad4e} .label-warning[href]:hover,.label-warning[href]:focus{background-color:#ec971f} .label-danger{background-color:#d9534f} .label-danger[href]:hover,.label-danger[href]:focus{background-color:#c9302c} </style></head><body> <span class="label label-default">默认标签</span> <span class="label label-primary">主要标签</span> <span class="label label-success">成功标签</span> <span class="label label-info">信息标签</span> <span class="label label-warning">警告标签</span> <span class="label label-danger">危险标签</span></body></html>