npm install --save qrcode

import QRCode from 'qrcode'

// index.js -> bundle.jsvar QRCode = require('qrcode')var canvas = document.getElementById('canvas') QRCode.toCanvas(canvas, '二维码内容xxxxxx', function (error) {  if (error) console.error(error)  console.log('success!');})

var QRCode = require('qrcode') QRCode.toDataURL('二维码内容xxxxxx!', function (err, url) { console.log(url) })

import QRCode from 'qrcode' // With promisesQRCode.toDataURL('二维码内容xxxxxx!') .then(url => { console.log(url) }) .catch(err => { console.error(err) })

// With async/await

let text = 'xxxxxxxx';const generateQR = async text => {  try {    console.log(await QRCode.toDataURL(text))  } catch (err) {    console.error(err)  }}