新增于: v0.3.4弃用于: v0.11.3
cryptoStream.bytesWritten 属性返回写入底层套接字的总字节数，包括实现 TLS 协议所需的字节数。
¥The cryptoStream.bytesWritten property returns the total number of bytes
written to the underlying socket including the bytes required for the
implementation of the TLS protocol.