前端数据流文件下载三种方式

1、直接使用get请求方式进行下载:

window.open(`${url}?${qs.stringify(param)}`, '_blank')

2、使用form 表单post请求进行下载:

const postDownloadFile = (action, param) => {
  const form = document.createElement('form');
  form.action = action;
  form.method = 'post';
  form.target = 'blank';
  Object.keys(param).forEach((item) => {
      const input = document.createElement('input');
      input.type = 'hidden';
      input.name = item;
      input.value = param[item];
      form.appendChild(input);
  });
  document.body.appendChild(form);
  form.submit();
  document.body.removeChild(form);
}
postDownloadFile(url, param);

3、axios(ajax)前端根据返回数据流生成文件下载:

axios.post(url, param, {responseType: 'blob'}).then((res) => {
  console.log('res', res);
  const blob = res.data;
  const reader = new FileReader();
  reader.readAsDataURL(blob);
  reader.onload = (e) => {
    const a = document.createElement('a');
    a.download = `文件名称.zip`;
    ********// 后端设置的文件名称在res.headers的 "content-disposition": "form-data; 
    ********//name=\"attachment\"; filename=\"20181211191944.zip\"",
    a.href = e.target.result;
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
  };
}).catch((err) => {
  console.log(err.message);
});

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