后台实现下载图片接口返回文件流，前端要如何调用并下载？？？

html页面

import {credentialsDownLoad} from "../../api/supply";

clickCredentialsDownLoad(row) {
      console.log(row);
      if(row.fileSuffix==".jpeg"||row.fileSuffix==".png"||row.fileSuffix==".jpg"
      ||row.fileSuffix==".svg"||row.fileSuffix==".dmp"){
        window.open(credentialsDownLoad(row.id), ‘_self‘, ‘width=0,height=0‘);
      }else{
        window.open(row.filePath, "_blank");
      }
      // this.download(row.filePath);
    },
          

supply.js文件
export function credentialsDownLoad (id) {
  return `${window.g_api.BASE_API}/supplier-credentials/downLoad?id=${id}`
}