writableStreamDefaultController.signal
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类型：<AbortSignal>
AbortSignal可用于在 <WritableStream> 中止时取消挂起的写入或关闭操作。¥Type: <AbortSignal> An
AbortSignalthat can be used to cancel pending write or close operations when a <WritableStream> is aborted.
类型：<AbortSignal> AbortSignal 可用于在 <WritableStream> 中止时取消挂起的写入或关闭操作。
¥Type: <AbortSignal> An AbortSignal that can be used to cancel pending
write or close operations when a <WritableStream> is aborted.