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.
nascent stages, MasterCard's predecessor pops up in 1966 to compete with Bank of
。safew官方下载对此有专业解读
Falls through to #GP
Alison Francis,Senior Science Journalist