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这也大幅带动了市场规模的整体上涨。，这一点在谷歌浏览器【最新下载地址】中也有详细论述
Web streams has no synchronous path. Even if your source has data ready and your transform is a pure function, you still pay for promise creation and microtask scheduling on every operation. Promises are fantastic for cases in which waiting is actually necessary, but they aren't always necessary. The new API lets you stay in sync-land when that's what you need.