GYEE_R.D
/
exam


			
				
					
						
						
							1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253
							
<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>CRC64</title>
    <style>
        h1 {
            font-weight: normal;
        }
    </style>
</head>
<body>

<div>
    <h1>JS 计算 CRC64</h1>
    <form id="form">
        <label>选择文件，计算 crc64：</label>
        <input id="file" type="file">
    </form>
    <div id="msg"></div>
</div>

<script src="./crc64.js"></script>
<script>
    var el = function (id) {
        return document.getElementById(id);
    };
    var calc = function (file) {
        var time0 = Date.now();
        CRC64.file_crc64(file, function (err, hash) {
            if (err) return console.log('crc64 error:', err);
            var time1 = Date.now();
            el('msg').innerHTML = 'cost ' + (time1 - time0) + 'ms, crc64=' + hash;
            el('form').reset();
        }, function (percent) {
            el('msg').innerHTML = (percent * 100).toFixed(2) + '%';
        });
    };
    el('file').onchange = function () {
        var file = this.files[0];
        calc(file);
    };

    // calc string crc64
    console.log(CRC64.crc64('123456789'));
</script>

</body>
</html>