详解easyui 切换主题皮肤

<!-- 引入easyui css样式 只需引入easyui.css  其中就包含了其他的内容-->
  <link rel="stylesheet" id="easyuiTheme" href="<%=request.getContextPath()%>/jquery-easyui-1.6.11/themes/default/easyui.css" rel="external nofollow" >
  <!-- 引入小图标 -->
  <link rel="stylesheet" href="<%=request.getContextPath()%>/jquery-easyui-1.6.11/themes/icon.css" rel="external nofollow" >
  <!-- 引入jQuery -->
  <script type="text/javascript" src="<%=request.getContextPath()%>/js/jquery-1.11.3.js"></script>
  <script src="js/jquery.cookie.js"></script>
  <!-- 引入easyui -->
  <script src="<%=request.getContextPath()%>/jquery-easyui-1.6.11/jquery.easyui.min.js" ></script>
  <!-- 样式转化为中文 -->
  <script src="<%=request.getContextPath()%>/jquery-easyui-1.6.11/locale/easyui-lang-zh_CN.js"></script>

<div style="position: absolute;right: 14px;top:42px;">
          <div style="padding:5px;">
            <a href="javascript:void(0);" rel="external nofollow" class="easyui-menubutton" data-options="menu:'#layout_north_pfMenu',iconCls:'icon-ok'">更换皮肤</a>
          </div>
        </div>
        <div id="layout_north_pfMenu" style=" display: none;">
          <div "changeTheme('default');">default</div>
          <div "changeTheme('black');">black</div>
          <div "changeTheme('bootstrap');">bootstrap</div>
          <div "changeTheme('gray');">gray</div>
          <div "changeTheme('metro');">metro</div>
        </div>

/**
   * 更换EasyUI主题的方法
   * @param themeName
   * 主题名称
   */
  changeTheme = function(themeName) {
    var $easyuiTheme = $('#easyuiTheme');
    var url = $easyuiTheme.attr('href');
    var href = url.substring(0, url.indexOf('themes')) + 'themes/' + themeName + '/easyui.css';
    $easyuiTheme.attr('href', href);
    var $iframe = $('iframe');
    if ($iframe.length > 0) {
      for ( var i = 0; i < $iframe.length; i++) {
        var ifr = $iframe[i];
        $(ifr).contents().find('#easyuiTheme').attr('href', href);
      }
    }
    $.cookie('easyuiThemeName', themeName, {
      expires : 7
    });
  };