这篇文章主要介绍bootstrap中如何添加额外的图标，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
说明
可以针对校验状态为输入框添加额外的图标。只需设置相应的 .has-feedback 类并添加正确的图标即可
示例
<!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 101 Template</title> <!-- Bootstrap --> <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="external nofollow" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh5u" crossorigin="anonymous"> <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries --> <!-- WARNING: Respond.js doesn't work if you view the page via file:// --> <!--[if lt IE 9]> <script src="https://cdn.bootcss.com/html5shiv/3.7.3/html5shiv.min.js"></script> <script src="https://cdn.bootcss.com/respond.js/1.4.2/respond.min.js"></script> <![endif]--> </head> <body> <div class="container"> <div class="form-group has-success has-feedback"> <label class="control-label" for="inputSuccess2">Input with success</label> <input type="text" class="form-control" id="inputSuccess2" aria-describedby="inputSuccess2Status"> <span class="glyphicon glyphicon-ok form-control-feedback" aria-hidden="true"></span> <span id="inputSuccess2Status" class="sr-only">(success)</span> </div> <div class="form-group has-warning has-feedback"> <label class="control-label" for="inputWarning2">Input with warning</label> <input type="text" class="form-control" id="inputWarning2" aria-describedby="inputWarning2Status"> <span class="glyphicon glyphicon-warning-sign form-control-feedback" aria-hidden="true"></span> <span id="inputWarning2Status" class="sr-only">(warning)</span> </div> <div class="form-group has-error has-feedback"> <label class="control-label" for="inputError2">Input with error</label> <input type="text" class="form-control" id="inputError2" aria-describedby="inputError2Status"> <span class="glyphicon glyphicon-remove form-control-feedback" aria-hidden="true"></span> <span id="inputError2Status" class="sr-only">(error)</span> </div> <div class="form-group has-success has-feedback"> <label class="control-label" for="inputGroupSuccess1">Input group with success</label> <div class="input-group"> <span class="input-group-addon">@</span> <input type="text" class="form-control" id="inputGroupSuccess1" aria-describedby="inputGroupSuccess1Status"> </div> <span class="glyphicon glyphicon-ok form-control-feedback" aria-hidden="true"></span> <span id="inputGroupSuccess1Status" class="sr-only">(success)</span> </div> </div> <!-- jQuery (necessary for Bootstrap's JavaScript plugins) --> <script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script> <!-- Include all compiled plugins (below), or include individual files as needed --> <script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script> </body> </html>
输出
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