如何替换查询字符串中的值？

// 解析查询字符串
function parseQueryString(url) {
  const queryString = url.split('?')[1];
  const params = {};
  if (queryString) {
    queryString.split('&').forEach((param) => {
      const [key, value] = param.split('=');
      params[key] = value;
    });
  }
  return params;
}

// 替换查询字符串中的值
function replaceQueryValue(url, key, newValue) {
  const params = parseQueryString(url);
  params[key] = newValue;
  
  // 重新构建查询字符串
  const newQueryString = Object.entries(params)
    .map(([key, value]) => `${key}=${value}`)
    .join('&');
  
  const baseUrl = url.split('?')[0];
  return `${baseUrl}?${newQueryString}`;
}

// 示例用法
const url = 'https://www.example.com/search?keyword=apple&page=1';
const newUrl = replaceQueryValue(url, 'keyword', 'banana');
console.log(newUrl);