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代码编辑器：

<!doctype html>
<meta charset="utf-8"/><style>html,body{height:100%}</style>
<!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>
<p>将错误信息放在 label 元素后并使用 span 元素包裹它</p>

<form method="get" class="cmxform" id="form1" action="">
  <fieldset>
    <legend>Login Form</legend>
    <p>
      <label for="user">Username</label>
      <input id="user" name="user" required minlength="3">
    </p>
    <p>
      <label for="password">Password</label>
      <input id="password" type="password" maxlength="12" name="password" required minlength="5">
    </p>
    <p>
      <input class="submit" type="submit" value="Login">
    </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() {
  // 提交时验证表单
  var validator = $("#form1").validate({
    errorPlacement: function(error, element) {
      // Append error within linked label
      $( element )
        .closest( "form" )
          .find( "label[for='" + element.attr( "id" ) + "']" )
            .append( error );
    },
    errorElement: "span",
    messages: {
      user: {
        required: " (必需字段)",
        minlength: " (不能少于 3 个字母)"
      },
      password: {
        required: " (必需字段)",
        minlength: " (字母不能少于 5 个且不能大于 12 个)",
        maxlength: " (字母不能少于 5 个且不能大于 12 个)"
      }
    }
  });

$(".cancel").click(function() {
    validator.resetForm();
  });
});
</script>

代码编辑器：

运行结果：