JavaScript迭代器 [英] JavaScript Iterators

问题描述

我正在浏览MDN（Mozilla开发者网络）并遇到了迭代器和生成器

I was going through MDN (Mozilla Developer Network) and came across Iterators and generators

很自然地，我尝试了Google Chrome v21页面中提供的代码片段。具体来说，这段代码：

So naturally, I tried the snippets of code given in the page on Google Chrome v21. To be specific, this code:

var it = Iterator(lang);
for (var pair in it)
  print(pair); // prints each [key, value] pair in turn

但是，控制台会返回以下错误消息：

However, the console returns this error message:

ReferenceError: Iterator is not defined

为什么？ Iterator函数是否已被弃用？我错过了一点吗？感谢您的帮助和时间： - ）

Why's that? Is the Iterator function deprecated or something? Am I missing a point? Thank you for your help and time :-)

推荐答案

来自此主题：

V8是ECMAScript的实现，而不是JavaScript。后者是Mozilla制作的ECMAScript的非标准化扩展。

V8 is an implementation of ECMAScript, not JavaScript. The latter is a non-standardized extension of ECMAScript made by Mozilla.

V8旨在与JSC（WebKit / Safari中的ECMAScript实现）插件兼容。因此，它实现了许多ECMAScript的非标准扩展，这些扩展也在JSC中，其中大多数也是Mozilla的JavaScript语言。

V8 is intended to be plug-in compatible with JSC, the ECMAScript implementation in WebKit/Safari. As such it implements a number of non-standard extensions of ECMAScript that are also in JSC, and most of these are also in Mozilla's JavaScript languages.

没有计划添加不在JSC中的非标准功能到V8。

There is no plan to add non-standard features that are not in JSC to V8.

注意：JSC代表 JavaScript核心 - WebKit ECMAScript实现。

Note: JSC stands for JavaScript Core - the WebKit ECMAScript implementation.

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