const cur = val; // 简化变量名，代表当前价格
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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.，详情可参考搜狗输入法下载
В Финляндии предупредили об опасном шаге ЕС против России09:28