PublicKeyCredential：signalUnknownCredential() 静态方法

signalUnknownCredential(options)

const credential = await navigator.credentials.get({
  challenge: new Uint8Array([139, 66, 181, 87, 7, 203 /* … */]),
  rpId: "example.com",
  allowCredentials: [],
  // Empty allowCredentials list means only discoverable
  // credentials are presented to the user
});

// Retrieve base64url-encoded credential ID,
// such as "vI0qOggiE3OT01ZRWBYz5l4MEgU0c7PmAA"
const credID = credential.id;
// Retrieve payload to send to the RP server
const payload = credential.toJSON();

const result = await fetch("/login", {
  // fetch() options, will include the payload in the request body
});

// Detect authentication failure due to lack of the credential
if (result.status === 404) {
  if (PublicKeyCredential.signalUnknownCredential) {
    await PublicKeyCredential.signalUnknownCredential({
      rpId: "example.com",
      credentialId: credID,
    });
  } else {
    // Encourage the user to delete the credential from the authenticator
  }
}