Vue使用html2canvas将页面转化为图片下载到本地

<div
  ref="codeRef"
  class="code text-white text-center p-20px relative mb-30px"
>
  <p class="text-xl mb-10px">
    {{ univName }}
  p>
  <p>报名点p>
  <img
    class="mt-22px"
    width="154"
    height="154"
    src="~assets/images/pages/opcenter/admissions/code.png"
    alt="报名二维码"
  />
  <p class="absolute bottom-12 left-0 w-full text-xs">
    招生老师：{{ teacherName }}
    {{ formState.phone }}
  p>
div>
<a-button
  class="default-acctive mr-12px flex-shrink-0 block m-auto"
  @click="downloadCode"
>
  下载报名海报
a-button>

const downloadCode = () => {
  html2canvas(this.$refs.codeRef).then(canvas => {
    const base64 = canvas.toDataURL(‘image/png‘)
    const myBlob = dataURLtoBlob(base64)
    const myUrl = URL.createObjectURL(myBlob)
    downloadFile(myUrl, ‘报名二维码‘)
  })
}
const dataURLtoBlob = (dataurl: string) => {
  const arr: any[] = dataurl.split(‘,‘)
  const mime = arr[0].match(/:(.*?);/)[1]
  const bstr = atob(arr[1])
  let n = bstr.length
  const u8arr = new Uint8Array(n)
  while (n--) {
    u8arr[n] = bstr.charCodeAt(n)
  }
  return new Blob([u8arr], { type: mime })
}
const downloadFile = (url: string, name: string) => {
  const a = document.createElement(‘a‘)
  a.setAttribute(‘href‘, url)
  a.setAttribute(‘download‘, name)
  a.setAttribute(‘target‘, ‘_blank‘)
  const clickEvent = document.createEvent(‘MouseEvents‘)
  clickEvent.initEvent(‘click‘, true, true)
  a.dispatchEvent(clickEvent)
}