npm install vue-qr --save

<template>
<vue-qr :text="link" :size="downImgSize" :margin="0" ref='Qrcode'></vue-qr>
<div class="mt20"> {{$t('二维码下载')}} ：
    <Button class="ml10 qrcodeImg" size='small' @click="downloadImg(512)">512 X 512</Button>
    <Button class="ml10 qrcodeImg" @click="downloadImg(256)">256 X 256</Button>
    <span class="tips ml10">{{$t('（点击即可下载）')}}</span>
</div>
</template>
 
<script>
import vueQr from 'vue-qr'
export default {
    components: {
        vueQr
    },
    data() {
        return {
         link: '后端返回的链接地址'，
         downImgSize: 512
        }
    },
      methods: {
    // 下载不同尺寸的二维码
    downloadImg (size) {
      this.downImgSize = size
      console.log(this.downImgSize)
      const iconUrl = this.$refs['Qrcode'].$el.src
      const a = document.createElement('a')
      const event = new MouseEvent('click')
      a.download = this.$t('领取链接二维码')
      a.href = iconUrl
      a.dispatchEvent(event)
    }
   }
}
</script>