docs/index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Uploader</title>
    <meta name="viewport" content="width=device-width,minimum-scale=1.0,maximum-scale=1.0,user-scalable=0"/>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        img{
            display: block;
            width: 400px;
        }
    </style>
</head>
<body>
<input type="file" name="" id="">
<img src="" alt="">
<script src="//cdn.staticfile.org/exif-js/2.3.0/exif.min.js"></script>
<script src="//unpkg.com/Imager@0.1.6/dist/Imager.min.js"></script>
<script>
    var fileInput, img
    fileInput = document.querySelector('input[type=file]')
    img = document.querySelector('img')
    fileInput.addEventListener('change', function(e){
        var file, imager
        file = e.target.files[0]
        if(file){
            if(window.Imager.isImage(file)) {
                imager = new window.Imager({
                    file: file,
                    quality: 1,
                    isLimit: false
                })
                imager.getExif().then(data => {
                    return imager.loaded()
                }).then(base64 => {
                    img.src = base64
                })
            } else {
                console.log('不是图片')
            }
        }
    })
</script>
</body>
</html>