React从单个阵列创建2D阵列

import React from 'react';

class Array2D extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      array: [1, 2, 3, 4, 5, 6, 7, 8, 9], // 单个阵列
      rows: 3, // 行数
      columns: 3, // 列数
      array2D: [], // 2D阵列
    };
  }

  componentDidMount() {
    this.createArray2D();
  }

  createArray2D() {
    const { array, rows, columns } = this.state;
    const array2D = [];

    let index = 0;
    for (let i = 0; i < rows; i++) {
      const row = [];
      for (let j = 0; j < columns; j++) {
        row.push(array[index]);
        index++;
      }
      array2D.push(row);
    }

    this.setState({ array2D });
  }

  render() {
    const { array2D } = this.state;

    return (
      <div>
        {array2D.map((row, rowIndex) => (
          <div key={rowIndex}>
            {row.map((item, columnIndex) => (
              <span key={columnIndex}>{item} </span>
            ))}
          </div>
        ))}
      </div>
    );
  }
}

export default Array2D;