重要：不要从手机自带的应用商店下载（基本上都没收录）
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，更多细节参见爱思助手下载最新版本
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When a host runtime provides a byte-oriented ReadableStream from the runtime itself, for instance, as the body of a fetch Response, it is often far easier for the runtime itself to provide an optimized implementation of BYOB reads, but those still need to be capable of handling both default and BYOB reading patterns and that requirement brings with it a fair amount of complexity.
▲ 图｜Tim’s Guide