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HTML

              
                <html>
  <head>
    <meta charset="utf-8">
    <script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/jquery.validate.js"></script>
  </head>
  <body>
    <form action="" method="post" id="form">
      <!-- mail -->
      <p class="is-error-email"></p>
      メールアドレス : <input type="mail" name="email"> 

      <p class="is-error-reemail"></p>
      確認用メールアドレス : <input type="mail" name="reemail"> 

      <br>
      <input type="submit">
    </form>
  </body>
</html>
              
            
!

CSS

              
                
              
            
!

JS

              
                $(function(){
  $('#form').validate({
    // バリデーションルール
    rules: {
        email: {
          required: true, 
          email: true,
        },
        reemail: {
          required: true, 
          email: true,
          equalTo: '[name=email]',
        },
    },
 
    // エラーメッセージ
    messages: {
        email: {
            required: 'メールアドレスを入力してください',
            email: 'メールアドレスの形式で入力してください',
        },
        reemail: {
            required: '確認用メールアドレスを入力してください',
            email: 'メールアドレスの形式で入力してください',
            equalTo: 'メールアドレスと同じアドレスを入力してください',
        },
    },
 
    // エラーメッセージ出力箇所
    errorPlacement: function(error, element){
        var name = element.attr('name');
        error.appendTo($('.is-error-'+name));
    },
 
    errorElement: "span",
    errorClass: "is-error",
});
});
              
            
!
999px

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