node.js是一個讓JavaScript運行在服務端的開發(fā)平臺，它讓JavaScript成為與PHP、Python、Perl、Ruby等服務端語言平起平坐的腳本語言，發(fā)布于2009年5月，由Ryan Dahl開發(fā)，實質是對Chrome V8引擎進行了封裝。node.js對一些特殊用例進行優(yōu)化，提供替代的API，使得V8在非瀏覽器環(huán)境下運行得更好。V8引擎執(zhí)行Javascript的速度非?？?，性能非常好。
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