A type identifier is placed in the message that indicates which type to create.

消息中的类型标识表明应该创建何种类型。

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Property containing the sender identifier of the message. The type is an array of bytes.

含有消息发送人标识符的属性。类型是字节数组。

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Property containing the sender identifier of the message. The type is an array of bytes.

含有消息发送人标识符的属性。类型是字节数组。

youdao