如何在React组件的状态内拼接数组

import React, { Component } from 'react';

class MyComponent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      myArray: [1, 2, 3],
    };
  }

  concatenateArray = () => {
    const { myArray } = this.state;
    const newArray = myArray.concat([4, 5, 6]);
    this.setState({ myArray: newArray });
  };

  render() {
    const { myArray } = this.state;
    return (
      <div>
        <button onClick={this.concatenateArray}>拼接数组</button>
        <ul>
          {myArray.map((item) => (
            <li key={item}>{item}</li>
          ))}
        </ul>
      </div>
    );
  }
}

export default MyComponent;