npm install qrcode --save

<template>
 <div id="qrCode">
 <div id="code"></div>
 <canvas id="canvas"></canvas>
 </div>
</template>
<script>
import QRCode from "qrcode";
export default {
 props: {
 url: {
 type: String
 }
 },
 data() {
 return {
 msg: "hello vue",
 codes: ""
 };
 },

 components: {
 QRCode: QRCode
 },

 methods: {
 useqrcode() {
 var canvas = document.getElementById("canvas");
 QRCode.toCanvas(canvas, this.url, function(error) {
 if (error) console.error(error);
 });
 }
 },

 mounted() {
 this.useqrcode();
 }
};
</script>
<style lang="stylus" scoped>
#qrCode {
 text-align: center;
}
</style>

<template>
 <div>
 <QRcode :url='url'/>
 </div>
</template>
<script>
import QRcode from '../../QRcode.vue'
export default {
components: {
 QRcode
},
data() {
 return {
 url:'(需要生成二维码的网址)'
 }
}
}
</script>