更新处于react状态的数组，使用concat

import React, { useState } from 'react';

function App() {
  const [array, setArray] = useState(['item1', 'item2', 'item3']);

  const updateArray = () => {
    const newItem = 'item4';
    const newArray = array.concat(newItem);
    setArray(newArray);
  };

  return (
    <div>
      <button onClick={updateArray}>Update Array</button>
      <ul>
        {array.map((item, index) => (
          <li key={index}>{item}</li>
        ))}
      </ul>
    </div>
  );
}

export default App;