1.文件单个上传时，看到的数据时时[object File]形式
const fd = new FormData();
fd.append('FFILES', this.fileList);
console.log(fd.getAll('FFILES'));
image.png
2.解决方法
const fd = new FormData();
this.fileList.forEach(item => fd.append('FFILES', item));
console.log(fd.getAll('FFILES'));
