返回表示本地证书的对象。 返回的对象有一些与证书字段对应的属性。

有关证书结构的示例,请参见 tls.TLSSocket.getPeerCertificate()

如果没有本地证书,则将返回空对象。 如果套接字被销毁,则返回 null

Returns an object representing the local certificate. The returned object has some properties corresponding to the fields of the certificate.

See tls.TLSSocket.getPeerCertificate() for an example of the certificate structure.

If there is no local certificate, an empty object will be returned. If the socket has been destroyed, null will be returned.