UnityEngine.Networking 中的类
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继承自：Networking.DownloadHandler
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实现于：UnityEngine.UnityWebRequestModule
一个通用的 DownloadHandler 实现，它将接收到的数据存储在本地字节缓冲区中。
这是一个通用的 DownloadHandler 子类。它将接收到的数据存储在本地内存中。它将根据任何接收到的 Content-Length 标头预先分配一个数据缓冲区，但如果实际下载大小超过 Content-Length 标头的值（或未收到 Content-Length 标头），则会扩展其缓冲区。
注意： 当访问此子类的 DownloadHandler.data 或 DownloadHandler.text 时，每次访问该属性时都会分配一个新的字节数组或字符串。
| DownloadHandlerBuffer | 默认构造函数。 |
| GetContent | 返回本地内存缓冲区的副本，该缓冲区被解释为 UTF8 字符串。 |
| data | 返回从远程服务器下载的原始字节，或者为 null。（只读） |
| error | 描述在下载处理程序内部发生的故障的错误消息。 |
| isDone | 如果此 DownloadHandler 已被其父 UnityWebRequest 通知已接收所有数据，并且此 DownloadHandler 已完成任何必要的下载后处理，则返回 true。（只读） |
| nativeData | 提供对下载数据的直接访问。 |
| text | 便捷属性。返回从数据解释为 UTF8 字符串的字节。（只读） |
| Dispose | 发出信号，表明此 DownloadHandler 不再使用，应该清理它正在使用的任何资源。 |
| CompleteContent | 回调，在从远程服务器接收所有数据时调用。 |
| GetData | 回调，在访问 data 属性时调用。 |
| GetNativeData | 提供对下载数据作为 NativeArray 的无分配访问。 |
| GetProgress | 回调，在访问 UnityWebRequest.downloadProgress 时调用。 |
| GetText | 回调，在访问 text 属性时调用。 |
| ReceiveContentLengthHeader | 回调，在收到 Content-Length 标头时调用。 |
| ReceiveData | 回调，在从远程服务器接收数据时调用。 |
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