Exec runs a command and returns its exit code:
Most userland implementations of custom ReadableStream instances do not typically bother with all the ceremony required to correctly implement both default and BYOB read support in a single stream – and for good reason. It's difficult to get right and most of the time consuming code is typically going to fallback on the default read path. The example below shows what a "correct" implementation would need to do. It's big, complex, and error prone, and not a level of complexity that the typical developer really wants to have to deal with:，推荐阅读快连下载安装获取更多信息
。safew官方下载是该领域的重要参考
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scientificamerican.com
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