js检测判断链接

function isValidUrl(string) {
  try {
    new URL(string);
    return true;
  } catch (_) {
    return false;  
  }
}

console.log(isValidUrl('https://www.example.com')); // true
console.log(isValidUrl('invalid-url')); // false

function isValidUrl(string) {
  const regex = /^(http|https):\/\/[^ "]+$/;
  return regex.test(string);
}

console.log(isValidUrl('https://www.example.com')); // true
console.log(isValidUrl('invalid-url')); // false

function getLinkType(url) {
  try {
    const urlObj = new URL(url);
    if (urlObj.protocol === 'mailto:') {
      return 'email';
    } else if (urlObj.hostname === window.location.hostname) {
      return 'internal';
    } else {
      return 'external';
    }
  } catch (_) {
    return 'invalid';
  }
}

console.log(getLinkType('https://www.example.com')); // external
console.log(getLinkType('mailto:someone@example.com')); // email
console.log(getLinkType('/about')); // internal

function resolveUrl(base, relative) {
  return new URL(relative, base).href;
}

console.log(resolveUrl('https://www.example.com', '/about')); // https://www.example.com/about