blob对象excel文件上传下载

页面结构

<el-upload style="width: 93%" action="/stap/systemManage/weakPassword/excelImport" accept=".xls,.xlsx" name="assetFile" multiple ref="upload" :before-upload="beforeUpload" :show-file-list="false" :http-request="uploadFile">
          <el-input class="input-with-select" placeholder="请选择xlsx/xls格式文件上传" v-model="input3" >
           <el-button style="position: relative;left: -0.5rem;" slot="append" type="primary">选择文件</el-button>
         </el-input>
</el-upload>

<el-button type="primary" @click="submit">提交</el-button>

<div  @click="downloadTemplate">下载</div>

函数

   // 文件上传前的判断
    beforeUpload(file) {
     var testmsg = file.name.substring(file.name.lastIndexOf(".") + 1);
      const extension = testmsg == "xlsx"||testmsg == "xls";
      if (!extension) {
        this.$message({
          message: "上传文件只能是xlsx或xls格式",
          type: "warning",
        });
      }
      return extension;
    },
    //文件上传到input框
    uploadFile(params) {
      this.input3 = params.file.name;
      this.formFile = new FormData();
      this.formFile.append("file", params.file);
    },
    //导入请求  （formDate格式请求体）
    submitAsset() {
+        if (this.input3 == "") {
+          this.$message({
+            type: "warning",
+            message: "请选择想要上传的文件!",
+          });
+        } else {
+          this.importLoading = true;
+          this.$axios({
+            url: "/stap/systemManage/weakPassword/excelImport",
+            method: "post",
+            data: this.formFile,
+            timeout: 10 * 60 * 1000,
+            headers: {
+              "Content-Type": "multipart/form-data",
+            },
+          }).then((res) => {
+              if (res.data.result) {
+              this.$message({type: 'success',message:res.data.message||'弱密码字典列表导入成功'});
+              this.$emit("tableInit"); //导入后刷新列表
+              this.closeDialog();
+              this.input3=''
+              }else{
+               this.$message.error(res.data.message)
+              }
+            })
+            .catch(() => {
+            }).finally(()=>{
+              this.importLoading = false;
+            })
         }
     },
    //下载文件
downloadTemplate(){
	                this.$axios({method:'get',url:'/stap/systemManage/weakPassword/download',responseType: 'blob'}).then(res=>{
			    if (res.data.result != false) {
+			      this.$message({type: 'success', message: "下载成功!"})
+			      let aTag = document.createElement('a');
+			      aTag.download = '弱字典密码列表模板.xlsx';
+			      aTag.style.display = 'none'
+			      let blob = new Blob([res.data],{type:'application/vnd.ms-excel'});
+			      aTag.href = URL.createObjectURL(blob);
+			      document.body.appendChild(aTag)
+			      aTag.click();
+			      document.body.removeChild(aTag)
+			    }
+			  })
+			},