在React中关闭对话框时保存计数变量

import React, { useState } from 'react';

function MyComponent() {
  const [count, setCount] = useState(0);

  // 其他组件代码...

  return (
    <div>
      <button onClick={() => setCount(count + 1)}>增加计数</button>
      <button onClick={() => setCount(count - 1)}>减少计数</button>
    </div>
  );
}

import React, { useState } from 'react';

function Dialog({ onClose }) {
  const [count, setCount] = useState(0);

  const handleClose = () => {
    // 在关闭对话框时保存计数变量
    // 可以通过回调函数的方式将计数变量传递给父组件
    onClose(count);
  };

  return (
    <div>
      <h2>对话框</h2>
      <p>计数: {count}</p>
      <button onClick={() => setCount(count + 1)}>增加计数</button>
      <button onClick={() => setCount(count - 1)}>减少计数</button>
      <button onClick={handleClose}>关闭对话框</button>
    </div>
  );
}

import React, { useState } from 'react';
import Dialog from './Dialog';

function App() {
  const [showDialog, setShowDialog] = useState(false);
  const [savedCount, setSavedCount] = useState(0);

  const handleDialogClose = (count) => {
    // 保存计数变量
    setSavedCount(count);
    setShowDialog(false);
  };

  return (
    <div>
      <button onClick={() => setShowDialog(true)}>打开对话框</button>
      {showDialog && <Dialog onClose={handleDialogClose} />}
      <p>保存的计数: {savedCount}</p>
    </div>
  );
}