首先要引入vue-pdf
我使用的是yarn add vue-pdf
首先要将流文件转为pdf

<template>
<v-pdf
  v-for="i in numPages"
  :key="i"
  class="v-pdf-item"
  :src="src"
  :page="i"
/>
</template>
<script>
import pdf from 'vue-pdf'
export default {
  components: {
    'v-pdf': pdf
  },
  methods: {
  // 流文件转pdf url
    getObjectURL(file) {
      let url = null
      if (window.createObjectURL !== undefined) { // basic
        url = window.createObjectURL(file)
      } else if (window.webkitURL !== undefined) { // webkit or chrome
        try {
          url = window.webkitURL.createObjectURL(file)
        } catch (error) {
          //
        }
      } else if (window.URL !== undefined) { // mozilla(firefox)
        try {
          url = window.URL.createObjectURL(file)
        } catch (error) {
          //
        }
      }
      return url
    },
    
    async reportPreview() {
      const result = await 后台接口
      const src = this.getObjectURL(result.data)
      this.src = pdf.createLoadingTask(src)
      this.src.promise.then(pdf => {
        this.numPages = pdf.numPages
      })
    }
  }
}

</script>

如果遇到报错就引入下边两个依赖基本上就能解决问题。
yarn add pdfjs-dist@2.5.207
yarn add vue-pdf@4.2.0