docs: function Combo(options) {
      this.options = _.extend({
          domain: 'imgcache.gtimg.cn',
          basePath: '/c/=',
          separator: ',',
          selectors: {
              script: /<(script)([^>]*)>((?:.|\r\n)*?)<\/script>/g,
              link: /<(link)([^>]*?)\/?>/g
          }
      }, options);
  }