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代码编辑器：

<!DOCTYPE html>
<meta charset="utf-8">
<link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/>
<style>
.error{
    color:red;
}
fieldset {border:1px solid #ddd;}
</style>
<form class="cmxform" id="commentForm" method="get" action="">
  <fieldset>
    <h3>输入您的名字，邮箱，URL，备注</h3>
    <p>
      <label for="cname">Name (必需, 最小两个字母)</label>
      <input id="cname" name="name" minlength="2" type="text" required>
    </p>
    <p>
      <label for="cemail">E-Mail (必需)</label>
      <input id="cemail" type="email" name="email" required>
    </p>
    <p>
      <label for="curl">URL (可选)</label>
      <input id="curl" type="url" name="url">
    </p>
    <p>
      <label for="ccomment">备注 (必需)</label>
      <textarea id="ccomment" name="comment" required></textarea>
    </p>
    <p>
      <input class="submit" type="submit" value="Submit">
    </p>
  </fieldset>
</form>
<footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
<script src="https://cdn.staticfile.org/jquery/2.2.4/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.17.0/jquery.validate.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.17.0/localization/messages_zh.js"></script>
<script>
$.validator.setDefaults({
    submitHandler: function() {
      alert("提交事件!");
    }
});
$().ready(function() {
    $("#commentForm").validate();
});
</script>

代码编辑器：

运行结果：