https://stackoverflow.com/questions/43013858/ajax-post-a-file-from-a-form-with-axios
var formData = new FormData();
var imagefile = document.querySelector('#file');
formData.append("stuff", "some information");
formData.append("file", imagefile.files[0]);
axios.post('upload_file', formData, {
headers: {
'Content-Type': 'multipart/form-data'
}
})
服务器端接收：https://stackoverflow.com/questions/10320232/how-to-accept-a-file-post
https://docs.microsoft.com/en-us/aspnet/web-api/overview/advanced/sending-html-form-data-part-2
https://stackoverflow.com/questions/37414415/uploading-a-file-and-form-data-in-web-api-and-angularjs
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