如果URL的参数包含`toD`中的值列表，则会将其折叠为单个值

https://example.com/?param1=value1&param2=value2

https://example.com/?toD=value1&toD=value2&toD=value3

https://example.com/?toD=value1,value2,value3

function foldUrlParams(url) {
  const urlObj = new URL(url);
  const params = new URLSearchParams(urlObj.search);
  const foldedParams = {};

  for (const [key, value] of params.entries()) {
    if (foldedParams[key]) {
      foldedParams[key] += `,${value}`;
    } else {
      foldedParams[key] = value;
    }
  }

  const foldedSearch = Object.entries(foldedParams)
    .map(([key, value]) => `${key}=${value}`)
    .join('&');

  return `${urlObj.origin}${urlObj.pathname}?${foldedSearch}`;
}

const originalUrl = 'https://example.com/?toD=value1&toD=value2&toD=value3';
const foldedUrl = foldUrlParams(originalUrl);
console.log(foldedUrl); // 输出: https://example.com/?toD=value1,value2,value3