我正在尝试找出 twitter bootstrap 的表单结构。我想更改为特定的验证状态http://getbootstrap.com/css/#forms-control-states(向下滚动一点)我有这个表格:
<form class="form-signin" id="registerForm">
<input class="form-control input-sm" type="email" placeholder="E-mail">
<input class="form-control input-sm" type="text" maxlength="30" placeholder="Username (6-30 characters)">
<input class="form-control input-sm" type="password" maxlength="30" placeholder="Password (6-30 characters)">
<button id="registerButton" class="btn-small"><b>Register</b></button>
</form>
我应该改变什么属性才能在输入字段上获得特定的验证颜色?