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.
“要为人民做实事”——这句话，朴素得像陕北的黄土地，却是政绩观最坚实的根基。
，详情可参考heLLoword翻译官方下载
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这个功能目前还处于早期预览阶段，仅在美国和韩国提供。