For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.
audioElement.buffered.end(i) current
，更多细节参见Line官方版本下载
Фото: U.S. Navy/Mass Communication Specialist 1st Class Jesse Monford / Handout / Reuters
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