<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<input type="file" accept="image/*" onchange="uploadFile(event)">
<script>
function uploadFile(event) {
let file = event.target.files[0]
let img = new Image()
let reader = new FileReader()
reader.readAsDataURL(file)
reader.onload = (e) => {
let data = e.target.result
let image = new Image()
image.src = data
image.onload = () => {
let width = image.width
let height = image.height
if (width > 100 || height > 100) {
console.log('image too huge!');
}
}
}
}
</script>
</body>
</html>