nodejs接连运行异步功能

问题描述：

我是JS/nodejs的新手，所以如果我不能提出直截了当的问题，请原谅我.

I'm new to JS/nodejs, so please pardon me if I can't ask to-the-point question.

所以基本上，如果我有两个异步函数，

So basically, if I have two async functions,

async function init() {...}
async function main() {...}

如何确保init()完成异步请求后调用main()?

How can I make sure to call main() after init() has finished its async requests?

具体来说，我想利用该模块 https://www.npmjs.com/package/hot-import

Specifically, I want to make use of the module https://www.npmjs.com/package/hot-import

在其页面上，有一个示例代码:

whereas on its page, there is a sample code:

async function main() {
  const MODULE_CODE_42 = 'module.exports = () => 42'
  const MODULE_CODE_17 = 'module.exports.default = () => 17'

  const MODULE_FILE = path.join(__dirname, 't.js')

  fs.writeFileSync(MODULE_FILE, MODULE_CODE_42)
  const hotMod = await hotImport(MODULE_FILE)
  . . .

该示例代码按原样工作，但是当我将其放入事件回调函数中时，事情开始中断-它适用于第一个事件触发器，但不适用于第二个事件触发器.

The sample code works as it is, but when I put that into a event call back function, things start to break -- It works for the first event trigger but not the second.

我认为问题不是常数hotMod，而是导致问题的 async 函数中的 await hotImport.因此，我正在尝试将hotMod定义为全局变量，并在调用 main()之前在async init()函数中执行hotMod = await hotImport(MODULE_FILE).但是到目前为止，由于我对JS/nodejs很陌生，所以我还没有做到.

I think the problem is not the constant hotMod, but the await hotImport in async function that is causing the problem. Thus I'm trying to define hotMod as a global variable and do hotMod = await hotImport(MODULE_FILE) in a async init() function before main() is called. But so far I've not been able to, as I'm quite new to JS/nodejs.

请帮助.谢谢.

答

使用aysnc等待

async function myFlow(){
.....
await init();
main();
....
}

在上面的代码中，仅当init被解析()时，才会调用main(). 希望对您有帮助.

In above code main() will be called only when init is resolved(). I hope this helps you.

nodejs接连运行异步功能

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