下载压缩文件的前端

     RequestHttp.POST(      "/charge/cost/sign/downLoadZip",
          para,
          "",             
           `arraybuffer` //一定要写
        )
          .then(res => {
            console.info(res);

            var blob = new Blob([res.data], {
              type: `application/zip`  //word文档为msword,pdf文档为pdf
            });
            var downloadElement = document.createElement("a");
            var href = window.URL.createObjectURL(blob); //创建下载的链接
            downloadElement.href = href;
            downloadElement.download = "导出文件.zip"; //下载文件的名字
            document.body.appendChild(downloadElement);
            downloadElement.click(); //点击下载
            document.body.removeChild(downloadElement); //下载完成移除元素
            window.URL.revokeObjectURL(href); //释放掉blob对象
          })
          .catch(err => {
            console.info(err);
          });