show---hide 应用

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
  <head>
    <title>Collapsible List &mdash; Take 1</title>
    <link rel="stylesheet" type="text/css" href="../common.css">
    <script type="text/javascript"
            src="../scripts/jquery-1.2.1.js"></script>
    <script type="text/javascript">
      $(function(){
        $('li:has(ul)')
          .click(function(event){
            if (this == event.target) {
              if ($(this).children().is(':hidden')) {
                $(this)
                  .css('list-style-image','url(minus.gif)')
                  .children().show();
              }
              else {
                $(this)
                  .css('list-style-image','url(plus.gif)')
                  .children().hide();
              }
            }
            return false;
          })
          .css('cursor','pointer')
          .click();
        $('li:not(:has(ul))').css({
          cursor: 'default',
          'list-style-image':'none'
        });
      });
    </script>
    <style>
      fieldset { width: 320px }
    </style>
  </head>

  <body>
    <fieldset>
      <legend>Collapsible List &mdash; Take 1</legend>
      <ul>
        <li>Item 1</li>
        <li>Item 2</li>
        <li>
          Item 3
          <ul>
            <li>Item 3.1</li>
            <li>
              Item 3.2
              <ul>
                <li>Item 3.2.1</li>
                <li>Item 3.2.2</li>
                <li>Item 3.2.3</li>
              </ul>
            </li>
            <li>Item 3.3</li>
          </ul>
        </li>
        <li>
          Item 4
          <ul>
            <li>Item 4.1</li>
            <li>
              Item 4.2
              <ul>
                <li>Item 4.2.1</li>
                <li>Item 4.2.2</li>
              </ul>
            </li>
          </ul>
        </li>
        <li>Item 5</li>
      </ul>
    </fieldset>
  </body>
</html>