JavaScript版本如何与ECMAScript版本相关联？ [英] How do JavaScript versions correlate to ECMAScript versions?

问题描述

例如， [] .map 是在JavaScript 1.6中实现。这是ES5方法吗？ 1.6如何与 ECMAScript 版本相关联？

For example, [].map was "implemented in JavaScript 1.6." Is that an ES5 method? How does the 1.6 correlate to an ECMAScript version?

推荐答案

Mozilla使用的版本号和ECMAScript标准版本号之间没有真正严格的对应关系。有一个维基百科上的表，可能就是你要找的 - 你会看到JavaScript 1.6对应于ECMAScript 3，然后是一些额外的扩展。 []。map 特别是在ECMAScript 5中标准化，但据我了解，该功能最初是由Firefox推出的，甚至在ECMAScript 5标准发布之前。 （包含JavaScript 1.6的Firefox 1.5于2005年11月29日发布，该标准似乎已于2009年9月发布。）

There aren't really strict correspondences between the version numbers Mozilla uses and the ECMAScript standard's version numbers. There's a table on Wikipedia that might be what you're looking for -- you'll see that JavaScript 1.6 corresponds to ECMAScript 3 and then some additional extensions. [].map specifically was standardized in ECMAScript 5, but to my understanding, the feature was first introduced by Firefox before the ECMAScript 5 standard was even published. (Firefox 1.5 which included JavaScript 1.6 was released on November 29, 2005, and the standard appears to have been published in September 2009.)

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