异步引发SyntaxError:意外令牌( [英] Async throwing SyntaxError: Unexpected token (

问题描述

我正在使用无头Chrome程序包进行测试木偶:

const puppeteer = require('puppeteer')

;(async() => {
  const browser = await puppeteer.launch()
  const page = await browser.newPage()
  await page.goto('https://google.com', {waitUntil: 'networkidle'})
  // Type our query into the search bar
  await page.type('puppeteer')

  await page.click('input[type="submit"]')

  // Wait for the results to show up
  await page.waitForSelector('h3 a')

  // Extract the results from the page
  const links = await page.evaluate(() => {
    const anchors = Array.from(document.querySelectorAll('h3 a'))
    return anchors.map(anchor => anchor.textContent)
  })
  console.log(links.join('\n'))
  browser.close()
})()

我将脚本运行为:node --harmony test/e2e/puppeteer/index.js(v6.9.1)

但是我得到这个错误:

;(async() => {
       ^
SyntaxError: Unexpected token (

可能是什么问题?

注意:我正在使用Vue CLI的官方Webpack模板:

我发现:节点LTS(AK​​A节点6)目前不支持异步/等待机制.看 :

有关详细信息，请参见此处: https://www. infoq.com/news/2017/02/node-76-async-await

I'm running a test using the headless Chrome package Puppeteer:

const puppeteer = require('puppeteer')

;(async() => {
  const browser = await puppeteer.launch()
  const page = await browser.newPage()
  await page.goto('https://google.com', {waitUntil: 'networkidle'})
  // Type our query into the search bar
  await page.type('puppeteer')

  await page.click('input[type="submit"]')

  // Wait for the results to show up
  await page.waitForSelector('h3 a')

  // Extract the results from the page
  const links = await page.evaluate(() => {
    const anchors = Array.from(document.querySelectorAll('h3 a'))
    return anchors.map(anchor => anchor.textContent)
  })
  console.log(links.join('\n'))
  browser.close()
})()

And I'm running the script as: node --harmony test/e2e/puppeteer/index.js (v6.9.1)

But I get this error:

;(async() => {
       ^
SyntaxError: Unexpected token (

What could be the problem?

Note: I'm using Vue CLI's official Webpack template:

解决方案

I found out: node LTS (AKA node 6) is not supporting async / await mechanism right now. See :

See here for details : https://www.infoq.com/news/2017/02/node-76-async-await

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