So fügen Sie Daten in einen Formulardaten in JavaScript an
formData.append('username', 'Chris');
formData.append('userpic', myFileInput.files[0], 'chris.jpg');
REX OMIV
formData.append('username', 'Chris');
formData.append('userpic', myFileInput.files[0], 'chris.jpg');formData.append(name, value);
formData.append(name, value, filename);