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wechat-demo
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1631694849033-194137.html

<!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>
    <div>
        <input type = "file" name = "file" onchange = "uploadFile(this);">
        <input type = "file" name = "2file" onchange = "uploadFile(this);">

    </div>
    <div>
        <pre id = "ret-content"></pre>
    </div>
    <script>
        function uploadFile(t){
            if(t.files.length<=0) return;
            let fm = new FormData();
            fm.append('file',t.files[0]);
            fetch('/upload',{
                method:'POST',
                body:fm
            })
            .then(res=>{
                return res.text();
            })
            .then(text=>{
                document.getElementById('ret-content').innerHTML = text;
            })
        }
    </script>
</body>
</html>