Set a custom attribute using a specified custom attribute blob.

提供对某一对象公开的属性和方法的访问。

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If there is no BOM and there is no given encoding attribute, the BLOB data is assumed to consist of UTF-8 code points.

如果没有BOM，也没有给定的编码属性，则假定BLOB数据由utf - 8代码点组成。

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BLOB serializations do not undergo any code page conversion, but they do get assigned an "encoding" attribute in the serialized header, which defaults to an encoding of UTF-8.

blob串行化不会经过任何代码页转换，但是在串行化后得到的头部中会被赋予一个“ encoding ”属性，该属性默认为UTF - 8编码。

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