jquery.validationEngine

http://www.position-absolute.com/articles/jquery-form-validator-because-form-validation-is-a-mess/
优秀的表达验证插件，配置相应的js和css后只需在input、select等表单标签的class属性中添加

<form id="formID" action="" method="post">

    <input class="validate[required,custom[email]]" type="text" name="email" />

    <input class="validate[required,custom[date]]" type="text" name="date" />

    <input class="validate[required,custom[onlyLetterNumber]]" type="text" name="special" />

</form>

类似于这样的验证规则，然后开启验证

<script>
    $(document).ready(function(){
        $("#formID").validationEngine('attach');
    });
</script>