code: function normalizeProps(props) {
      Object.keys(props).forEach(k => {
          let propValue = props[k];
          let defaultValue = null;
          if (propValue && propValue.default !==  undefined) {
              defaultValue = propValue.default;
          }
          props[k] = defaultValue;
      });
      return props;
  }
docs: Normalize component props data using mini program syntax
  
  @param {Object} props the props data to normalize
  @return {?Object}