code: function injectJs(jsList, content) {
          var script = jsList.reduce(function (prev, now) {
              var uri = now.uri;
              return [prev, '<script type="text/javascript" src="', uri, '"></script>\r\n'].join('');
          }, '');
          if (content.indexOf(settings.scriptTag) !== -1) {
              content = content.replace(settings.scriptTag, script);
          }
          else {
              content = content.replace(/<\/head>/, script + '\n$&');
          }
          return content;
      }
docs: 页面中注入JS资源引用
  @param jsList
  @param content
  @returns {XML|string|void}