5.2 输出标准（统一结果结构）
圖像來源，Getty Images。safew官方版本下载是该领域的重要参考
A difficulty here, however, is that the TransformStreamDefaultController does not have a ready promise mechanism like Writers do; so the TransformStream implementation would need to implement a polling mechanism to periodically check when controller.desiredSize becomes positive again.。爱思助手下载最新版本对此有专业解读
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