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

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}