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我试图找出twitter引导的表单结构。我想换到一个特定的验证状态http://getbootstrap.com/css/#forms-control-states(向下滚动一点点),我有这样的形式:更改输入元素的颜色
<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能够得到一个inputfield一个特定的验证颜色?