我尝试从 https://cdn.jsdelivr.net/npm/marked/marked.min.js 导入函数 marked 。我已通过 mount() 注入 <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script> 。但它总是抛出错误 [Vue warn]: Error in render: "ReferenceError: marked is not defined" 。为什么即使添加了脚本后它仍未定义？

<script>
export default {
  name: 'Upload',
  data () {
    return {
      title: '',
      content: ''
    }
  },
  mounted () {
    let externalScript = document.createElement('script')
    externalScript.setAttribute('src', 'https://cdn.jsdelivr.net/npm/marked/marked.min.js')
    Plugin.async = true
    document.head.appendChild(externalScript)
  },
  computed: {
    markdown2html: function () {
      return marked(this.content)
    }
  }
}
</script>