vue 中实现下载后端返回的流式数据

    /**
     * @Event 验证是否为blob格式
     * */
    export async function blobValidate(data) {
      try {
        const text = await data.text();
        JSON.parse(text);
        return false;
      } catch (error) {
        return true;
      }
    }

     /**
        * @Event: get请求下载后端返回的数据流
        * @description: url[String]: 接口地址，params[Object]: 需要携带的参数，name[String]: 导出的文件名[默认取接       	 ResponseHeaders的'content-disposition'的值]
        * @author: mhf
        * @time: 2024-01-24 18:37:36
        **/
        
    export function download(url, params, name) {
        let downloadLoadingInstance;
        downloadLoadingInstance = Loading.service({
            text: "正在下载数据，请稍候",
            spinner: "el-icon-loading",
            background: "rgba(0, 0, 0, 0.7)",
        });
        return service
            .get(url, {
            headers: { "Content-Type": "application/x-www-form-urlencoded" },
            params: params,
            responseType: "blob",
        })
            .then(async (data) => {
            const isBlob = await blobValidate(data.data);
            const fileNameEncode =
                  data.headers["content-disposition"].split("filename=")[1];
            // 解码
            var fileName = decodeURIComponent(fileNameEncode);
            if (isBlob) {
                const blob = new Blob([data.data]);
                saveAs(blob, fileName || name);
            } else {
                const resText = await data.text();
                const rspObj = JSON.parse(resText);
                const errMsg = rspObj.message;
                Message.error(errMsg);
            }
            downloadLoadingInstance.close();
        })
            .catch((r) => {
            console.error(r);
            Message.error("下载文件出现错误，请联系管理员！");
            downloadLoadingInstance.close();
        });
    }

        <el-button
            type="text"
            @click="handleExport(item.id, item.reportName)"
            icon="iconfont if-xiazai"
            >下载
        </el-button>
    
    
        handleExport(id, name) {
          this.download(
            requestType.trafficTrend + "/trafficRun/dataReport/exportDay",
            { id },
    	   `${name}.doc`,
          );
        },
    

 
    /**
       * @Event: post请求下载后端返回的数据流
       * @description: url[String]: 接口地址，formData[Object]: 需要携带的参数，name[String]: 导出的文件名[默认取接       	 ResponseHeaders的'content-disposition'的值]
       * @author: mhf
       * @time: 2024-01-24 18:37:36
       **/
   
   export function downloadPost(formData, url, name) {
     let downloadLoadingInstance;
     downloadLoadingInstance = Loading.service({
       text: "正在下载数据，请稍候",
       spinner: "el-icon-loading",
       background: "rgba(0, 0, 0, 0.7)",
     });
     return axios({
       method: "post",
       url: process.env.VUE_APP_BASE_API + url, // 请求地址
       data: formData, // 参数
       responseType: "blob", // 表明返回服务器返回的数据类型
       headers: {
         Authorization: getToken(),
         "Content-Type": "application/json",
       },
     }).then(async (data) => {
       const isBlob = await blobValidate(data.data);
       const fileNameEncode =
         data.headers["content-disposition"]?.split("filename=")[1];
       var fileName = decodeURIComponent(fileNameEncode);
       if (isBlob) {
         const blob = new Blob([data.data]);
         saveAs(blob, fileName);
       } else {
         const resText = await data.text();
         const rspObj = JSON.parse(resText);
         const errMsg = rspObj.message;
         Message.error(errMsg);
       }
       downloadLoadingInstance.close();
     });
   }

    export function downloadPost(formData, url) {
      let downloadLoadingInstance;
      downloadLoadingInstance = Loading.service({
        text: "正在下载数据，请稍候",
        spinner: "el-icon-loading",
        background: "rgba(0, 0, 0, 0.7)",
      });
      return axios({
        method: "post",
        url: process.env.VUE_APP_BASE_API + url, // 请求地址
        data: formData, // 参数
        responseType: "blob", // 表明返回服务器返回的数据类型
        headers: {
          Authorization: getToken(),
          "Content-Type": "application/json",
        },
      }).then(async (data) => {
        const isBlob = await blobValidate(data.data);
        const fileNameEncode =
          data.headers["content-disposition"].split("filename=")[1];
        var fileName = decodeURIComponent(fileNameEncode);
        if (isBlob) {
          // 判断返回的是文件流
          const blob = new Blob([data.data]);
          saveAs(blob, fileName);
        } else {
          let isBlob1 = await blobValidate(data)
          if (isBlob1) {
            // 判断返回的是数据流
            const blob1 = new Blob([data.data]);
            saveAs(blob1, fileName);
          } else {
            const resText = await data.text();
            const rspObj = JSON.parse(resText);
            const errMsg = rspObj.message;
            Message.error(errMsg);
          }
        }
        downloadLoadingInstance.close();
      });
    }

    downloadPost(
                response.data,
                requestType.system + "/system/axis/exportExcel"
              );