后端返回一大串base64位的pdf文件流前端如何实现功能

方法一：

const pdf = "data:application/pdf;base64," + 'pdf文件流';
window.document.write('<iframe src="' + pdf + '" frameborder="0" style="width:100%; height:100vh;"></iframe>')

方法二：

const base64Str = 'pdf文件流';
const blobObj = XnUtils.base64ToBlob(base64Str, 'application/pdf');
const dataUrl = URL.createObjectURL(blobObj);
if (window.navigator && window.navigator.msSaveOrOpenBlob) {
  window.navigator.msSaveOrOpenBlob(blobObj);
} else {
  window.open(dataUrl);
}