将参数传递到后台屏幕，并在react native中设置状态

import React, { useState, useEffect } from 'react';

const YourComponent = () => {
  const [data, setData] = useState(null);

  useEffect(() => {
    // 创建请求对象
    const xhr = new XMLHttpRequest();
    xhr.open('POST', 'http://yourbackendurl.com/screen', true);
    xhr.setRequestHeader('Content-Type', 'application/json');

    // 设置请求参数
    const params = { param1: 'value1', param2: 'value2' };

    // 发送请求
    xhr.send(JSON.stringify(params));

    // 请求完成后的回调函数
    xhr.onload = () => {
      if (xhr.status === 200) {
        const response = JSON.parse(xhr.responseText);
        // 更新组件状态
        setData(response);
      }
    };
  }, []);

  return (
    <div>
      {data && <p>Data received from backend screen: {data}</p>}
    </div>
  );
};

export default YourComponent;