text: /**
   * bold command.
   * @author yiminghe@gmail.com
   */
  KISSY.add("editor/plugin/bold/cmd", function (S, Editor, Cmd) {
      var BOLD_STYLE = new Editor.Style({
          element:'strong',
          overrides:[
              {
                  element:'b'
              },
              {
                  element:'span',
                  attributes:{
                      style:'font-weight: bold;'
                  }
              }
          ]
      });
      return {
          init:function (editor) {
              Cmd.addButtonCmd(editor, "bold", BOLD_STYLE);
          }
      }
  }, {
      requires:['editor', '../font/cmd']
  });