问从CDN加载时jspdf不工作

EN

<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js"></script>

mounted() {
  if (document.getElementById('myScript')) { return }
  let src = 'https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js'
  let script = document.createElement('script')
  script.setAttribute('src', src)
  script.setAttribute('type', 'text/javascript')
  script.setAttribute('id', 'myScript')
  document.head.appendChild(script)
}

generateReport() {
  var doc = new jsPDF('l', 'mm', [62, 32])
  const margins = {
    top: 0,
    bottom: 60,
    left: 0,
    width: 122
  }

  doc.fromHTML(this.$refs.print, margins.left, margins.top, {
    width: margins.width
  })

  doc.save('test.pdf')
}