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<div class="geininlist">
<p><input type="checkbox" name="geinin[]" value="ブルゾン">ブルゾンちえみ</p>
<p><input type="checkbox" name="geinin[]" value="サンシャイン">サンシャイン池崎</p>
<p><input type="checkbox" name="geinin[]" value="アキラ">アキラ100%</p>
<div style="margin-top:30px;">他に好きな芸人がいる場合は、こちらから追加してください。</div>
<input type="text" id="addgeinin">
<button type="button" id="btn">追加!</button>
              $(function() {
  $('#btn').click(function() {
    // テキストボックスに入力した名前を変数に格納
    var addgeinin = $('#addgeinin').val();
    // appendで動的に追加
    $('.geininlist').append('<input type="checkbox" name="geinin[]" value="'+addgeinin+'">'+addgeinin);

$(document).on('change', 'input[name="geinin[]"]', function() {
    // チェックが入った個数を変数に格納
    var top = $('input[name="geinin[]"]:checked').length;
    // チェックが1つ入ったら
    if (top >= 1) {
      // disabledを付ける
      $('input[name="geinin[]"]').not(':checked').attr('disabled', 'disabled');
    // チェックが1つ未満だったら
    } else {
      // disabledを削除

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