承诺异步函数

你不需要我在评论中提到的异步生活。代码中的更多内容可以简化为:

async function runTest({_id, name, live, dev}) {
  // we can have one try/catch since you close browser at any error
  try{
    const browser = await puppeteer.launch();
    const page = await browser.newPage();
  }
  catch(error) {
    return await browser.close()
  }
}

module.exports = async (tests) => {
  try{
    const data = await Promise.all(tests.map(test => runTest(test)));
    console.log('Done resolving')
  }
  catch(e){ console.log(e)}
}

我认为您可能在runtest中丢失了一个return语句,但我不知道为什么首先需要匿名异步函数,比如@thereson提到的:

async function runTest({
    _id,
    name,
    live,
    dev
}) {
    return (async () => { // here
        const browser = await puppeteer.launch();
        try {
            const page = await browser.newPage();

        } catch (error) {

            await browser.close()

        } finally {
            await browser.close()
            return
        }
    })();
}

直截了当的方法:

function launch() {
  return new Promise(function(resolve, reject) {
    setTimeout(resolve, 5000, 'blast off!')
  })
}

async function doSomething(id) {
  const message = await launch()
  return `${message} [${id}]`
}


let runs = [10, 20, 30].map(doSomething)

Promise.all(runs).then(function(values) {
  console.log(values)
})

//outputs
[ 'blast off! [10]', 'blast off! [20]', 'blast off! [30]' ]