base64转formData数据上传图片

const data = window.atob(base64);
const ia = new Uint8Array(data.length);
for (let i = 0; i < data.length; i++) {
   ia[i] = data.charCodeAt(i);
}
const blob = new Blob([ia], { type: 'image/jpeg' });
const fd = new FormData();
fd.append('file', blob, new Date().getTime() + '.jpg');