<form role="form">
<div class="form-group">
<input class="form-control input-lg" type="text" placeholder=".input-lg">
</div>
<div class="form-group">
<input class="form-control" type="text" placeholder="默认输入">
</div>
<div class="form-group">
<input class="form-control input-sm" type="text" placeholder=".input-sm">
</div>
<div class="form-group"></div>
<div class="form-group">
<select class="form-control input-lg">
<option value="">.input-lg</option>
</select>
</div>
<div class="form-group">
<select class="form-control">
<option value="">默认选择</option>
</select>
</div>
<div class="form-group">
<select class="form-control input-sm">
<option value="">.input-sm</option>
</select>
</div>
<div class="row">
<div class="col-lg-2">
<input type="text" class="form-control" placeholder=".col-lg-2">
</div>
<div class="col-lg-3">
<input type="text" class="form-control" placeholder=".col-lg-3">
</div>
<div class="col-lg-4">
<input type="text" class="form-control" placeholder=".col-lg-4">
</div>
</div></form>
