全面解析Bootstrap表单使用方法（表单控件状态）

<form role="form" class="form-horizontal">
 <div class="form-group">
 <div class="col-xs-6">
 <input class="form-control input-lg" type="text" placeholder="不是焦点状态下效果">
 </div>
 <div class="col-xs-6">
 <input class="form-control input-lg" type="text" placeholder="焦点点状态下效果">
 </div>
 </div>
</form>

<form role="form">
 <input class="form-control input-lg" id="disabledInput" type="text" placeholder="表单已被禁用，不可输入" disabled>
 <fieldset disabled>
 <div class="form-group">
 <label for="disabledTextInput">禁用的输入框</label>
 <input type="text" id="disabledTextInput" class="form-control" placeholder="禁止输入">
 </div>
 <div class="form-group">
 <label for="disabledSelect">禁用的下拉框</label>
 <select id="disabledSelect" class="form-control">
 <option>不可选择</option>
 </select>
 </div>
 <div class="checkbox">
 <label>
 <input type="checkbox"> 无法选择
 </label>
 </div>
 <button type="submit" class="btn btn-primary">提交</button>
 </fieldset>
</form>

<form role="form">
 <div class="form-group has-success">
 <label class="control-label" for="inputSuccess1">成功状态</label>
 <input type="text" class="form-control" id="inputSuccess1" placeholder="成功状态" >
 </div>
 <div class="form-group has-warning">
 <label class="control-label" for="inputWarning1">警告状态</label>
 <input type="text" class="form-control" id="inputWarning1" placeholder="警告状态">
 </div>
 <div class="form-group has-error">
 <label class="control-label" for="inputError1">错误状态</label>
 <input type="text" class="form-control" id="inputError1" placeholder="错误状态">
 </div>
</form>