//column.js
import { Component, PropTypes } from 'react';

export default class Column extends Component {
  static propTypes = {
    className: PropTypes.string,
    colSpan: PropTypes.number,
    title: PropTypes.node,
    dataIndex: PropTypes.string,
    width: PropTypes.oneOfType([
      PropTypes.number,
      PropTypes.string,
    ]),
    fixed: PropTypes.oneOf([
      true,
      'left',
      'right',
    ]),
    render: PropTypes.func,
    onCellClick: PropTypes.func,
  }
}

//index.js
const Table = require('./Table');
const Column = require('./Column');
const ColumnGroup = require('./ColumnGroup');

Table.Column = Column;
Table.ColumnGroup = ColumnGroup;

module.exports = Table;

Table.Column = Column;这一行代码表示什么意思