bootstrap text 样式

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<h3>示例2</h3>   
<form role="form">
  <div class="form-group has-success has-feedback">
    <label class="control-label" for="inputSuccess1">成功状态</label>
    <input type="text" class="form-control" id="inputSuccess1" placeholder="成功状态" >
    <span class="glyphicon glyphicon-ok form-control-feedback"></span>
  </div>
  <div class="form-group has-warning has-feedback">
    <label class="control-label" for="inputWarning1">警告状态</label>
    <input type="text" class="form-control" id="inputWarning1" placeholder="警告状态">
    <span class="glyphicon glyphicon-warning-sign form-control-feedback"></span>
  </div>
  <div class="form-group has-error has-feedback">
    <label class="control-label" for="inputError1">错误状态</label>
    <input type="text" class="form-control" id="inputError1" placeholder="错误状态">
    <span class="glyphicon glyphicon-remove form-control-feedback"></span>  
  </div>