el-upload中返回流文件并进行下载

1、el-upload上传excel后返回流文件并进行下载处理

elementUI中 el-upload不支持配置responseType: “blob”，所以需要使用el-upload中的http-request进行自定义上传接口请求。

<el-upload
        :http-request="uploadExcel"
        ref="upload"
        :limit="1"
        accept=".xlsx, .xls"
        :headers="upload.headers"
        :action="upload.url"
        :disabled="upload.isUploading"
        :auto-upload="false"
        drag
      >
        <i class="el-icon-upload">i>
        <div class="el-upload__text">将文件拖到此处，或<em>点击上传em>div>
        <div class="el-upload__tip text-center" slot="tip">
          <span>仅允许导入xls、xlsx格式文件。span>
        div>
      el-upload>

 uploadExcel(data) {
      var _this = this;
      let params = new FormData();
      params.append("file", data.file);
      axios
        .post('接口', params, {
          responseType: "blob",
          headers: {
            "Content-Type": "application/json",
            Authorization: 'token',//token
          },
        })
        .then((response) => {
        //判断是否导入成果
          if (response.data.type == "application/json") {
           //导入成功
          } else {
          //导入失败返回流文件
            _this
              .$confirm("确定要导出失败的数据吗?", "提示", {
                confirmButtonText: "确定",
                cancelButtonText: "取消",
                type: "warning",
              })
              .then(() => {
                const blob = new Blob([response.data]);
                const a = document.createElement("a");
                const url = window.URL.createObjectURL(blob);
                const filename = Date.parse(new Date()) + ".xlsx";
                a.href = url;
                a.download = filename;
                a.click();
                window.URL.revokeObjectURL(url);
              })
              .catch(() => {});
          }
        })
        .catch((error) => {
          console.log(error);
        });
    },