code: function parseCover(str) {
      str = str.split(EOL);
      var obj = {};
      var reg = /(\w+)\s?:\s?(.+)/;
      str.forEach(function(val) {
          if (val = reg.exec(val)) {
              obj[val[1]] = val[2];
          }
      });
      return obj;
  }
docs: 解析cover的json字符串
  @param  {[type]} str [description]
  @return {[type]}     [description]