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study2021wechat
/
upload.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>Upload Test</title>
</head>
<body>
    <div>
        <input type="file" name="file" 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=>{
                if(res.ok){
                    return res.text();
                }
                throw new Error(`${res.status} ${res.statusText}`)
            })
            .then(text=>{
                let d = document.getElementById('ret-content');
                d.innerHTML=`<img src="/image/${text}" style="width:80%;height:auto;">`;
            })
            .catch(err=>{
                console.error(err.message);
            });
        }
    </script>
</body>
</html>