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if (len === 0) return [];，这一点在搜狗输入法2026中也有详细论述
，更多细节参见雷电模拟器官方版本下载
reader.releaseLock();
The Writer is not a concrete class. Any object that implements write(), end(), and abort() can be a writer making it easy to adapt existing APIs or create specialized implementations without subclassing. There's no complex UnderlyingSink protocol with start(), write(), close(), and abort() callbacks that must coordinate through a controller whose lifecycle and state are independent of the WritableStream it is bound to.，更多细节参见safew官方版本下载