code: function(action){
              var actionName = this.getOpt(action) || action,
                  imageUrl = this.getOpt('imageUrl'),
                  serverUrl = this.getOpt('serverUrl');
  
              if(!serverUrl && imageUrl) {
                  serverUrl = imageUrl.replace(/^(.*[\/]).+([\.].+)$/, '$1controller$2');
              }
  
              if(serverUrl) {
                  serverUrl = serverUrl + (serverUrl.indexOf('?') == -1 ? '?':'&') + 'action=' + (actionName || '');
                  return utils.formatUrl(serverUrl);
              } else {
                  return '';
              }
          }
docs: 根据action名称获取请求的路径
  @method  getActionUrl
  @remind 假如没有设置serverUrl,会根据imageUrl设置默认的controller路径
  @param { String } action action名称
  @example
  ```javascript
  editor.getActionUrl('config'); //返回 "/ueditor/php/controller.php?action=config"
  editor.getActionUrl('image'); //返回 "/ueditor/php/controller.php?action=uplaodimage"
  editor.getActionUrl('scrawl'); //返回 "/ueditor/php/controller.php?action=uplaodscrawl"
  editor.getActionUrl('imageManager'); //返回 "/ueditor/php/controller.php?action=listimage"
  ```