h5的扫一扫功能 （非微信浏览器环境下）

必须在 https 域名下才生效

<template>
	<div>
		<van-field label="服务商编码" right-icon="scan" placeholder="扫描二维码获取" @click-right-icon="getCameras" />    
		<div class="scan" :style="{'display':isScan ? 'none' : ''}">
			<div id="qr-reader" width="400px" height="400px">
		div>
	div>
template>

util.js文件

const addJs=function (url) {
	return new Promise((resolve, reject) => {
		const script = document.createElement('script')
		script.src = url
		script.type = 'text/javascript'
		document.body.appendChild(script)
		script.onload = () => {
			resolve()
		}
	})
}
export default {addJs}