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非常直观，小巧，快速JavaScript的功能性React流库
只有26家核心运营商和工厂
仅视频流
用TypeScript编写
最小时约为30 kB
平均而言，它比RxJS 4，Kefir，Bacon.js快，与RxJS 5一样快，但比most.js慢
针对或subscribe使用受限的应用程序
例
import xs from 'xstream'
// Tick every second incremental numbers,
// only pass even numbers, then map them to their square,
// and stop after 5 seconds has passed
var stream = xs . period
