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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.，这一点在Safew下载中也有详细论述
Opens in a new window，更多细节参见一键获取谷歌浏览器下载
触控版 MacBook Pro 曝光：配备灵动岛与 OLED 屏、今年亮相