string 作为 text 属性的返回值返回的字符串。
访问 text 属性时调用的回调。
此方法的返回值将作为 data 属性的值返回。
将在主线程中调用此方法。
如果不覆盖，此回调的默认行为是调用 GetData。如果 GetData 返回 null 或一个空字符串，则此方法将分别返回 null 或一个空字符串.否则，此方法会将从 GetData 返回的字节数组解码为一个 UTF8 字符串并返回解码后的字符串。
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