mikan-s https://blog.hatena.ne.jp/mikan-s/ mikan-sの日記 https://mikan-s.hatenadiary.org/ javascript <input type="radio" name="radioButtonName" value="a">あ <input type="radio" name="radioButtonName" value="i">い <input type="radio" name="radioButtonName" value="u">う // 「い」を選択 document.getElementsByName( 'radioButtonName' )[ 1 ].checked = true; 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmikan-s.hatenadiary.org%2Fentry%2F20080816%2F1218878299" title="ラジオボタンの変更 - mikan-sの日記" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2008-08-16 18:18:19 rich https://mikan-s.hatenadiary.org/entry/20080816/1218878299 1.0 100%