formData文件下载

//创建内存中的表单对象

var form = new FormData();
//向其中添加要传输的数据
form.append( "参数名" , 参数值);

axios.post(downloadUrl, form
, { responseType: 'blob'
}).then(res => {
  let blob = res.data
  let reader = new FileReader()
  reader.readAsDataURL(blob)
  reader.onload = (e) => {
  let a = document.createElement('a')
  a.download = '文件名'
  a.href = e.target.result
  document.body.appendChild(a)
  a.click()
  document.body.removeChild(a) }
})




//第二种写法

 this.httpclient.request('POST', url, {
            responseType: 'blob',
            params: new HttpParams({
                fromObject: requestParam //传入的参数对象
            }),
            body: requestParam
        }).toPromise().then((val) => {
            //   从后台查询到数据后进行导出最后的操作
            const blob = new Blob([val], { type: 'application/vnd.ms-excel' });
            const fileName = curFileName + '.xls';
            if (window.navigator.msSaveOrOpenBlob) {// For IE浏览器
                navigator.msSaveBlob(blob, fileName);
            } else { // For 其他浏览器
                const objectUrl = URL.createObjectURL(blob);
                const a = document.createElement('a');
                document.body.appendChild(a);
                a.setAttribute('style', 'display:none');
                a.setAttribute('href', objectUrl);
                a.setAttribute('download', fileName);
                a.click();
                URL.revokeObjectURL(objectUrl);
            }
        } 

转载于:https://www.cnblogs.com/cs122/p/9665043.html