用JavaScript实现端口扫描器

<form>
<label for="target">target</label><br/>
<input type="text" name="target" value="
www.gnucitizen.org"/><br/>
<label for="port">port</label><br/>
<input type="text" name="port" value="80"/><br/>
<p>you can use sequence as well 80,81,8080</p>
<label for="timeout">timeout</label><br/>
<input type="text" name="timeout" value="1000"/><br/>
<label for="result">result</label><br/>
<textarea id="result" name="result" rows="7" cols="50"></textarea><br/>
<input class="button" type="button" value="scan" onClick="javascript:scan(this.form)"/>
</form>

<script>
var AttackAPI = {
    version: 0.1,
    author: Petko Petkov (architect),
    homepage: http://www.gnucitizen.org};

AttackAPI.PortScanner = {};
AttackAPI.PortScanner.scanPort = function (callback, target, port, timeout) {
    var timeout = (timeout == null)?100:timeout;
    var img = new Image();
   
    img.onerror = function () {
        if (!img) return;
        img = undefined;
        callback(target, port, open);
    };
   
    img.onload = img.onerror;
    img.src = http:// + target + : + port;
   
    setTimeout(function () {
        if (!img) return;
        img = undefined;
        callback(target, port, closed);
    }, timeout);
};
AttackAPI.PortScanner.scanTarget = function (callback, target, ports, timeout)
{
    for (index = 0; index < ports.length; index++)
        AttackAPI.PortScanner.scanPort(callback, target, ports[index], timeout);
};
</script>
<script>
var result = document.getElementById(result);
var callback = function (target, port, status) {
    result.value += target + : + port + + status + " ";
};
var scan = function (form) {
    AttackAPI.PortScanner.scanTarget(callback, form.target.value, form.port.value.split(,), form.timeout.value);
};
</script>

补充：web前端 , JavaScript ,