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// https://stackoverflow.com/questions/4998908/convert-data-uri-to-file-then-append-to-formdata
// https://stackoverflow.com/questions/27553617/convert-blob-to-file
// 转换图片 base64 => file
function dataURItoFile(dataURI, fileName) {
var byteString = atob(dataURI.split(',')[1]);
var ab = new ArrayBuffer(byteString.length);
var ia = new Uint8Array(ab);
for (var i = 0; i < byteString.length; i++) {
ia = byteString.charCodeAt(i);
}
// return new Blob([ab], { type: 'image/jpeg' });
return new File([ia], fileName, {type: 'image/jpeg', lastModified: Date.now()})
}