<input id="uploadFile" name="file" type="file">
<script>
const file = document.getElementById('uploadFile')
let formData = new FormData()
formData.append('file', file.files[0])
const req = new XMLHttpRequest()
req.onreadystatechange = function(){
if (req.readyState === 4) {
const response = JSON.parse(req.responseText)
if (response.code === '200') {
console.log('success')
} else {
console.log('fail')
}
}
}
req.open('post', 'https://sxxx.com/uploadfile', true)
req.send(formData)
</script>