<!DOCTYPE html> <html lang="ja-JP"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width,user-scalable=yes,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.5"> <title></title> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script> <script> $(function(){ $("button").click(function(){ $(":checkbox").attr("checked","checked"); }); }); </script> <body> スキル: <input type="checkbox" name="xhtml" value="XHTML" id="xhtml"> <label for="xhtml">XHTML</label> <input type="checkbox" name="css" value="CSS" id="css"> <label for="css">CSS</label> <input type="checkbox" name="javascript" value="JavaScript" id="javascript"> <label for="javascript">JavaScript</label> <input type="checkbox" name="php" value="PHP" id="php"> <label for="php">PHP</label> <p><button>すべてにチェックを付ける</button></p> </body> </html>