activated () {
    // TO DO
},

import { fileDownloadList, fileDownload } from "@/api/file/download";
fileDownload(row.fileId).then(
        response => {
          console.log(response)
          const filename = decodeURI(response.headers['content-disposition'].split(';')[1].split('=')[1]);
          let blob = new Blob([response.data],{
            type: response.headers['content-type']
          });
          var blobURL = window.URL.createObjectURL(blob)
          var tempLink = document.createElement('a')
          tempLink.style.display = 'none'
          tempLink.href = blobURL
          tempLink.setAttribute('download', filename)
          if (typeof tempLink.download === 'undefined') {
            tempLink.setAttribute('target', '_blank')
          }
          document.body.appendChild(tempLink)
          tempLink.click()
          document.body.removeChild(tempLink)
          window.URL.revokeObjectURL(blobURL)
        }
      ).catch(err => {
        console.log(err);
      });

终于下载下来了，但是万万没想到啊，除了txt格式的打开的内容是正常的，其他格式如docx打开的却是乱码。

使用如下方法可以解决文件内容乱码问题：

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<el-table-column
        label="序号"
        type="index"
        width="50"
        align="center">
    <template scope="scope">
        <span>{{(page - 1) * pageSize + scope.$index + 1}}</span>
    </template>
</el-table-column>

npm install jquery --save

vue.config.js

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