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                這一章展示了Node中我們將異步I/O作為主要設計理念的原因。另外,還會介紹到異步I/O的詳細實現過程。? 事件循環是異步實現的核心,它與瀏覽器中的執行模型基本上保持一致。而向古老的[Rhino](https://developer.mozilla.org/zh-CN/docs/Mozilla/Projects/Rhino),盡管是較早就能在服務器運行的JavaScript運行時但是執行模型并不像瀏覽器采用事件驅動,而是使用像其他語言一樣采用同步I/O作為主要模型,這造成它在性能上面無法發揮。**Node正是依靠構建了一套完善的高性能異步I/O框架,打破了JavaScript在服務器止步不前的局面。**?[腦圖](http://naotu.baidu.com/viewshare.html?shareId=au9i4efc4u0w) ![Node異步I/O](https://box.kancloud.cn/2015-07-15_55a634adf19a0.png)
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