SOURCE

const child = {
    template: '<h1>HHHH</h1>'
}

const app = new Vue({
    components: {
        'child': child
    },
    data: {
        name: 'etst'
    }
})

app.$mount('.app')

const clg = console.log

clg(child.content)
setTimeout(() => {

new QRCode(document.getElementById("qrcode"), "http://jindo.dev.naver.com/collie");
}, 1000)

<div class="app">
    {{name}}
    <child></child>
</div>
<div id="qrcode"></div>