vue-qr生成下载二维码

<vue-qr  ref="Qrcode"
    :text="qrCodeConfig.text"
    :download="downloadFilename"
    :margin="10"
    :size="200"
    :dotScale="qrCodeConfig.dotScale"
    :colorDark="qrCodeConfig.colorDark"
>
</vue-qr>
data(){
    return {
        qrCodeConfig: {
            text: 'http://121.40.121.142:8080/register?parent_id='+id,
            dotScale: 0.9,
            colorDark: '#663300'
        },
        downloadFilename:''
    }
}

<template>
  <div class="full-screen-btn-con">
    <Button type="warning" @click="showImage">获取二维码</Button>
    <Modal
        v-model="modal"
        title="经济人二维码"
        >
        <div class="code-img">
          <vue-qr  ref="Qrcode" :text="qrCodeConfig.text" :download="downloadFilename" :margin="10" :size="200" :dotScale="qrCodeConfig.dotScale" :colorDark="qrCodeConfig.colorDark"></vue-qr>
        </div>
        <div slot="footer">
          <Button type="primary" @click="downloadImg">下载二维码</Button>
          <Button type="primary" @click="modal = !modal">关闭</Button>
        </div>
    </Modal>
  </div>
</template>
<script>
import VueQr from 'vue-qr'
export default {
  name: 'Fullscreen',
  components: {
    VueQr
  },
  data(){
    let id = this.$store.state.user.userId;
    return {
      modal : false,
      qrCodeConfig: {
        text: 'http://121.40.122.152:8080/register?parent_id='+id,
        dotScale: 0.9,
        colorDark: '#663300'
      },
      downloadFilename:''
    }
  },
  methods: {
    showImage (sid, key, index) {
        this.modal = true
    },
    downloadImg () {
          const iconUrl = this.$refs.Qrcode.$el.src
          let a = document.createElement('a')
          let event = new MouseEvent('click')
          a.download = '二维码'
          a.href = iconUrl
          a.dispatchEvent(event)
    }
  },
  mounted () {
  }
}
</script>
<style lang="less" scoped>
  .code-img{
    text-align: center;
  }
</style>