利用FormData对象进行下载文件

const formData = new FormData();
formData.append('参数1', 参数1);
formData.append('参数2', 参数2);
formData.append('参数3', 参数3);
formData.append('参数4', 参数4);
formData.append('参数5', 参数5);
//...............以此类推
fetch(`/api${PREFIX_URL}/export`, {
  method: 'POST',
  body: formData,
  headers:{
    'token':store.state.token,
    //headers携带的各种数据
  }
})
  .then(response => {
    if (!response.ok) {
      throw new Error('Network response was not ok');
    }
    return response.blob(); // 将响应转换为 Blob 对象
  })
  .then(blob => {
    // 创建一个链接元素
    const url = window.URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = this.projectInfo.projectName+'.'+(this.exportInfo.fileType==='1'?'xlsx':'csv'); // 设置下载的文件名
    document.body.appendChild(a);
    a.click(); // 触发下载
    a.remove(); // 移除链接元素
    window.URL.revokeObjectURL(url); // 释放 URL 对象
  })
  .catch(error => {
    console.error('There was a problem with the fetch operation:', error);
  });