在节点7.4中使用异步/等待 [英] Using async/await in node 7.4

问题描述

我认为节点7.4支持异步/等待，但是此示例不起作用:

I thought async/await was supported in node 7.4, however this example does not work:

const Promise = require('bluebird');

async function main(){
  await Promise.delay(1000)
}

main();

结果:

async function main(){
      ^^^^^^^^
SyntaxError: Unexpected token function

如何对节点7.4使用异步/等待?

How can I use async/await with node 7.4?

推荐答案

是的，Node.js v7支持async-await，但将其锁定在harmony标志后面.尚未准备就绪的功能不在此标记后面.

Yes async-await is supported in Node.js v7 but its locked behind the harmony flag. Features which are not yet production ready are behind this flag.

要在Node.js v7中使用async-await，只需使用此标志运行Node服务-

To use async-await in Node.js v7 simply run Node service with this flag -

node --harmony-async-await app.js

async-await的正式发行版预定于4月启动的Node.js v8.

The official release of async-await is slated for Node.js v8 which will be launched in April.

您可以按照此拉取请求来检查其状态.基本上，async-await的正确功能取决于将V8引擎v5.5集成到Node.js中.当前，Node.js使用V8 v5.4，此拉取请求已解决该问题.

You can follow this pull request to check its status. Basically the correct functioning of async-await is dependent on the integration of V8 engine v5.5 into Node.js. Currently Node.js uses V8 v5.4 which is solved by this pull request.

更新1 -似乎V8 v5.5即将加入Node.js v7.请遵循此拉取请求以获取更多详细信息.

Update 1 - It seems V8 v5.5 might be coming to Node.js v7. Follow this pull request for more details.

更新2 -大家好！现在，Node.js版本7.6.0正式支持async功能，而无需使用--harmony标志，因为已成功移植V8引擎5.5.

Update 2 - Good news guys! Node.js version 7.6.0 now officially supports async functions without using the --harmony flag as V8 engine 5.5 has been successfully ported.

现在，如果您的Node.js版本在7.0到7.5.0(含)之间，则仅需要使用--harmony标志.有关完整的更改日志，请此处.

Now you only need to use the --harmony flag if your Node.js version is between 7.0 to 7.5.0 (inclusive). For complete changelog refer here.

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