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Jquery全选,Jquery全不选,Jquery反选

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  <html xmlns="http://www.w3.org/1999/xhtml">  <head>      <title>全选,不全选,反选</title>      <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js"></script>    <script language="javascript" type="text/javascript">          $(function () {              $("#selectAll").click(function () {//全选                  $("#playList :checkbox").attr("checked", true);              });                $("#unSelect").click(function () {//全不选                  $("#playList :checkbox").attr("checked", false);              });                $("#reverse").click(function () {//反选                  $("#playList :checkbox").each(function () {                      $(this).attr("checked", !$(this).attr("checked"));                  });              });          });      </script>  </head>  <body>      <div id="playList">          <input type="checkbox" value="歌曲1" />歌曲1<br />          <input type="checkbox" value="歌曲2" />歌曲2<br />          <input type="checkbox" value="歌曲3" />歌曲3<br />          <input type="checkbox" value="歌曲4" />歌曲4<br />          <input type="checkbox" value="歌曲5" />歌曲5<br />          <input type="checkbox" value="歌曲6" />歌曲6      </div>      <input type="button" value="全选" id="selectAll" />      <input type="button" value="全不选" id="unSelect" />      <input type="button" value="反选" id="reverse" />  </body>  </html>