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如何在第 4 阶段之前体验一个提案 #8921

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> * 原文作者：[Ecma TC39](https://github.com/tc39/how-we-work)
> * 译文出自：[掘金翻译计划](https://github.com/xitu/gold-miner)
> * 本文永久链接：[https://github.com/xitu/gold-miner/blob/master/article/ECMA-TC39/How-to-experiment-with-a-proposal-before-Stage-4.md](https://github.com/xitu/gold-miner/blob/master/article/ECMA-TC39/How-to-experiment-with-a-proposal-before-Stage-4.md)
> * 译者：
> * 校对者：
> * 译者：[霜羽 Hoarfroster](https://github.com/PassionPenguin)
> * 校对者：[finalwhy](https://github.com/finalwhy)，[zaviertang](https://github.com/zaviertang)

# How to experiment with a proposal before Stage 4
# 如何在第 4 阶段之前体验一个提案

For JavaScript programmers who want to be adventurous and give TC39 feedback on proposals, there are various ways they can try things out:
对于敢于冒险并想就提案向 TC39 给予反馈的 JavaScript 程序员而言，可以通过以下几种方式提前尝试新提案：

- For code which does not require maintenance across TC39 language design changes, experiment with the feature by turning it on using runtime or build-time flags, for example:
- In Babel, enable the feature in your selected Babel preset (see [babel/proposals](https://github.com/babel/proposals/issues) for feature status).
- Get advanced versions of web browsers such as Edge Insider Edition, Safari Tech Preview, Firefox Nightly, or Chrome Canary for certain new language features. See their release notes to learn what's included.
- Use TypeScript, which implements several Stage 3 TC39 proposals.
- In V8, turn the feature on by passing in a flag beginning with `--harmony` found in [flag-definitions.h](https://github.com/v8/v8/blob/master/src/flag-definitions.h). Note that some flagged implementations may be unstable or incomplete and should not generally be used in production.
- In Node.js based on V8, the flag can be passed directly as such
- Within Chrome, enable "experimental JavaScript features" in about:flags, or use the command-line argument `--js-flags=--harmony-<flagname>`.
- If implementations are missing, [add one](https://github.com/tc39/how-we-work/blob/master/implement.md)!
- When you have feedback on the proposal, file it as an issue in the GitHub repository of the proposal
- 对于不需要通过 TC39 语言设计更改进行维护的代码，通过使用运行时或构建时标志将其打开来试验该功能，例如：
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- 对于不需要通过 TC39 语言设计更改进行维护的代码，通过使用运行时或构建时标志将其打开来试验该功能，例如：
- 对于不需要通过 TC39 语言设计更改进行维护的代码，通过使用运行时或构建时的配置将其打开来试验该功能，例如：

- 在 Babel 中，启用你选择的 Babel 预设中的功能（请参阅 [babel/proposals](https://github.com/babel/proposals/issues) 了解功能状态）。
- 使用高级版本的 Web 浏览器，例如 **Edge Insider Edition**、**Safari Tech Preview**、**Firefox Nightly** 或 **Chrome Canary**，以获得某些新语言功能。你可以选择去查看他们的发行说明以了解包含的内容。
- 使用 TypeScript —— TypeScript 实现了多个 Stage 3 TC39 的提案。
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- 使用 TypeScript —— TypeScript 实现了多个 Stage 3 TC39 的提案。
- 使用 TypeScript，TypeScript 实现了多个 Stage 3 阶段的 TC39 提案。

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，逗号会割裂两个句子，还是留破折号吧

- 在 V8 中，通过传入一个以 `--harmony` 开头的标志来开启对应的实验性功能，你可以在 [flag-definitions.h](https://github.com/v8/v8/blob/master/src/flag-definitions.h) 中找到这些标志。请注意，某些标记的实现可能不稳定或不完整，通常不应在生产环境中使用。
- 在基于 V8 的 Node.js 中，可以像这样直接传递标志；
- 在 Chrome 中，在 `about:flags` 中启用“实验性 JavaScript 功能”，或使用命令行参数 `--js-flags=--harmony-<flagname>`。
- 如果缺少实现，你可以自己动手 [添加一个](https://github.com/tc39/how-we-work/blob/master/implement.md)！
- 如果你想给提案提出一些反馈，可以在 GitHub 仓库中创建一个 issue。

WARNING: Proposals at Stage 3 and below are subject to significant change or removal.
警告：第 3 阶段及以下阶段的提案可能会发生重大变化或删除。

> 如果发现译文存在错误或其他需要改进的地方，欢迎到 [掘金翻译计划](https://github.com/xitu/gold-miner) 对译文进行修改并 PR，也可获得相应奖励积分。文章开头的 **本文永久链接** 即为本文在 GitHub 上的 MarkDown 链接。
---
> [掘金翻译计划](https://github.com/xitu/gold-miner) 是一个翻译优质互联网技术文章的社区，文章来源为 [掘金](https://juejin.im) 上的英文分享文章。内容覆盖 [Android](https://github.com/xitu/gold-miner#android)、[iOS](https://github.com/xitu/gold-miner#ios)、[前端](https://github.com/xitu/gold-miner#前端)、[后端](https://github.com/xitu/gold-miner#后端)、[区块链](https://github.com/xitu/gold-miner#区块链)、[产品](https://github.com/xitu/gold-miner#产品)、[设计](https://github.com/xitu/gold-miner#设计)、[人工智能](https://github.com/xitu/gold-miner#人工智能)等领域，想要查看更多优质译文请持续关注 [掘金翻译计划](https://github.com/xitu/gold-miner)、[官方微博](http://weibo.com/juejinfanyi)、[知乎专栏](https://zhuanlan.zhihu.com/juejinfanyi)。