确定给定的url (来自字符串)是否来自我的域

function isUrlFromMyDomain(url, myDomain) {
  const urlObj = new URL(url);
  const urlDomain = urlObj.hostname.toLowerCase();
  const myDomainParts = myDomain.toLowerCase().split('.');
  
  // 检查每个子域是否匹配
  for (let i = myDomainParts.length - 1; i >= 0; i--) {
    const subDomain = myDomainParts.slice(i).join('.');
    if (urlDomain === subDomain) {
      return true;
    }
  }
  
  return false;
}

// 示例用法
const url = "https://www.example.com/path/to/page";
const myDomain = "example.com";
const isFromMyDomain = isUrlFromMyDomain(url, myDomain);
console.log(isFromMyDomain);  // 输出 true