upload-server/main.html at master · Honohonoho/upload-server · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>upload</title>
    <style>
        form{ border: 1px solid red;}
    </style>
</head>
<body>
<form id=f action="" method="post">
    <div>
        <input type="file" name="file">
    </div>
    <div>
        <input type="submit" value="提交">
    </div>
</form>
<div>
    <img id=img src="" alt="">
</div>
<script>
    f.addEventListener('submit', function(e){
        e.preventDefault();
        var formData = new FormData();
        var fileInput = document.querySelector('input[name="file"]');
        formData.append('file', fileInput.files[0]);
        var xhr = new XMLHttpRequest();
        xhr.open('POST', 'http://127.0.0.1:3000/upload');
        xhr.onload = function() {
            console.log(xhr.response);
            img.src= 'http://127.0.0.1:3000/preview/' + xhr.response;
        };
        xhr.send(formData);
    });
</script>
</body>
</html>