* 时间复杂度：O(len1 + len2)，空间复杂度：O(len2)（栈+Map的空间）
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.，这一点在搜狗输入法下载中也有详细论述
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