使用Jquery验证数据注释，不显示错误消息

<script src="jquery.min.js"></script>
<script src="jquery.validate.min.js"></script>

<form id="myForm">
  <label for="name">姓名：</label>
  <input type="text" id="name" name="name" placeholder="请输入姓名" />
  <br />
  <label for="email">邮箱：</label>
  <input type="text" id="email" name="email" placeholder="请输入邮箱" />
  <br />
  <label for="password">密码：</label>
  <input type="password" id="password" name="password" placeholder="请输入密码" />
  <br />
  <input type="submit" value="提交" />
</form>

$(document).ready(function() {
  $("#myForm").validate({
    rules: {
      name: "required",
      email: {
        required: true,
        email: true
      },
      password: {
        required: true,
        minlength: 6
      }
    },
    messages: {
      name: "请输入姓名",
      email: {
        required: "请输入邮箱",
        email: "请输入有效的邮箱地址"
      },
      password: {
        required: "请输入密码",
        minlength: "密码长度不能少于6个字符"
      }
    },
    errorPlacement: function(error, element) {
      // 隐藏错误消息，显示注释信息
      return true;
    }
  });
});