el-upload 上传.pdf文件，并读取文件内容

<template>
  <div>
    <el-upload class="upload-demo" :action="/file/upload/" accept=.pdf" name="upfile" :on-success="
                  (response, file, fileList) => {
                    return handleImgSuccess(response, file, fileList)
                  }
                ">
      <el-button size="small" type="primary">点击上传</el-button>
    </el-upload>
    <div v-html="pdfContent"></div>
  </div>
</template>

<script>
import pdfjsLib from "pdfjs-dist";
export default {
  data() {
    return {
      pdfContent: "",
    };
  },
  methods: {
    handleImgSuccess(res, file) {
      console.log(res, file);
      const fileObj = file.raw;
      if (fileObj.type === "application/pdf") {
        const reader = new FileReader();
        reader.onload = (e) => {
          const arrayBuffer = e.target.result;
          this.parsePdfFile(arrayBuffer);
        };
        reader.readAsArrayBuffer(fileObj);
      } else {
        this.$message.error("只能上传.pdf文件");
      }
    },
    parsePdfFile(arrayBuffer) {
      pdfjsLib
        .getDocument(arrayBuffer)
        .promise.then((pdf) => {
          let pageNumber = 1;
          let pagePromises = [];
          while (pageNumber <= pdf.numPages) {
            pagePromises.push(this.getPageText(pdf, pageNumber));
            pageNumber++;
          }
          Promise.all(pagePromises)
            .then((pages) => {
              let text = "";
              pages.forEach((page) => {
                text += page;
              });
              this.pdfContent = text;
            })
            .catch((error) => {
              console.error("解析.pdf文件失败", error);
            });
        })
        .catch((error) => {
          console.error("读取文件失败", error);
        });
    },
    getPageText(pdf, pageNumber) {
      return new Promise((resolve, reject) => {
        pdf
          .getPage(pageNumber)
          .then((page) => {
            page.getTextContent().then((textContent) => {
              let text = "";
              textContent.items.forEach((item) => {
                text += item.str + " ";
              });
              resolve(text);
            });
          })
          .catch((error) => {
            reject(error);
          });
      });
    },
  },
};
</script>