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const origAddSB = MS.prototype.addSourceBuffer;。关于这个话题，heLLoword翻译官方下载提供了深入分析
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Now, he's working on a two-legged version that will require even more responsive legs to keep its balance while lugging Bruton around.
The Web streams spec requires promise creation at numerous points, often in hot paths and often invisible to users. Each read() call doesn't just return a promise; internally, the implementation creates additional promises for queue management, pull() coordination, and backpressure signaling.，详情可参考51吃瓜