几个比较有意思的JS脚本

1.获取内网和公网真实IP地址（引用地址）

代码太长，见原文链接

2.获得flash版本（在线地址）

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
<script>
function flashver() {
    var flash = function() {};
    flash.prototype.controlVersion = function() {
        var version;
        var axo;
        var e;
        try {
            axo = new ActiveXObject("ShockwaveFlash.ShockwaveFlash.7");
            version = axo.GetVariable("$version")
        } catch(e) {}
        if (!version) {
            try {
                axo = new ActiveXObject("ShockwaveFlash.ShockwaveFlash.6");
                version = "WIN 6,0,21,0";
                axo.AllowScriptAccess = "always";
                version = axo.GetVariable("$version")
            } catch(e) {}
        }
        if (!version) {
            try {
                axo = new ActiveXObject("ShockwaveFlash.ShockwaveFlash.3");
                version = axo.GetVariable("$version")
            } catch(e) {}
        }
        if (!version) {
            try {
                axo = new ActiveXObject("ShockwaveFlash.ShockwaveFlash.3");
                version = "WIN 3,0,18,0"
            } catch(e) {}
        }
        if (!version) {
            try {
                axo = new ActiveXObject("ShockwaveFlash.ShockwaveFlash");
                version = "WIN 2,0,0,11"
            } catch(e) {
                version = -1
            }
        }
        var verArr = version.toString().split(",");
        var str = "";
        for (var i = 0,
        l = verArr.length; i &lt; l; i++) {
            if (verArr[i].indexOf("WIN") != -1) {
                str += verArr[i].substring(3);
                str += "."
            } else {
                if (i == (l - 1)) {
                    str += verArr[i]
                } else {
                    str += verArr[i];
                    str += "."
                }
            }
        }
        return (str)
    };
    flash.prototype.getSwfVer = function() {
        var isIE = (navigator.appVersion.indexOf("MSIE") != -1) ? true: false;
        var isWin = (navigator.appVersion.toLowerCase().indexOf("win") != -1) ? true: false;
        var isOpera = (navigator.userAgent.indexOf("Opera") != -1) ? true: false;
        var flashVer = -1;
        if (navigator.plugins != null && navigator.plugins.length > 0) {
            if (navigator.plugins["Shockwave Flash 2.0"] || navigator.plugins["Shockwave Flash"]) {
                var swVer2 = navigator.plugins["Shockwave Flash 2.0"] ? " 2.0": "";
                var flashDescription = navigator.plugins["Shockwave Flash" + swVer2].description;
                var descArray = flashDescription.split(" ");
                var tempArrayMajor = descArray[2].split(".");
                var versionMajor = tempArrayMajor[0];
                var versionMinor = tempArrayMajor[1];
                var versionRevision = descArray[3];
                if (versionRevision == "") {
                    versionRevision = descArray[4]
                }
                if (versionRevision[0] == "d") {
                    versionRevision = versionRevision.substring(1)
                } else {
                    if (versionRevision[0] == "r") {
                        versionRevision = versionRevision.substring(1);
                        if (versionRevision.indexOf("d") > 0) {
                            versionRevision = versionRevision.substring(0, versionRevision.indexOf("d"))
                        }
                    }
                }
                var flashVer = versionMajor + "." + versionMinor + "." + versionRevision
            }
        } else {
            if (navigator.userAgent.toLowerCase().indexOf("webtv/2.6") != -1) {
                flashVer = 4
            } else {
                if (navigator.userAgent.toLowerCase().indexOf("webtv/2.5") != -1) {
                    flashVer = 3
                } else {
                    if (navigator.userAgent.toLowerCase().indexOf("webtv") != -1) {
                        flashVer = 2
                    } else {
                        if (isIE && isWin && !isOpera) {
                            flashVer = new flash().controlVersion()
                        }
                    }
                }
            }
        }
        return flashVer
    };
    if (flash.prototype.getSwfVer() == -1) {
        return "No Flash!"
    } else {
        return "Shockwave Flash " + flash.prototype.getSwfVer()
    }
}
alert(flashver());
</script> 
</body>
</html>

3.扫描HTTP端口（在线版本）

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
<script>
  var RTCPeerConnection = window.webkitRTCPeerConnection || window.mozRTCPeerConnection;
function ipCreate(ip){
    var ips = ip.replace(/(d+.d+.d+).d+/,'$1.');
    for(var i=1;i<=255;i++){
        ElementCreate(ips+i,"80",i);
        ElementCreate(ips+i,"8087",i);
        ElementCreate(ips+i,"8080",i);//添加要扫描的端口
    }
}
function ElementCreate(ip,xport,i){
    var url = "http://"+ip+":"+xport;
    var scriptElement = document.createElement("script");
    scriptElement.src=url;
    scriptElement.setAttribute("onload","alert('"+ip+"："+xport+"')");
    document.body.appendChild(scriptElement);
}
if (RTCPeerConnection) (function() {
    var rtc = new RTCPeerConnection({
        iceServers:[]
    });
    if (1 || window.mozRTCPeerConnection) {
        rtc.createDataChannel("", {
            reliable:false
        });
    }
    rtc.onicecandidate = function(evt) {
        if (evt.candidate) grepSDP("a=" + evt.candidate.candidate);
    };
    rtc.createOffer(function(offerDesc) {
        grepSDP(offerDesc.sdp);
        rtc.setLocalDescription(offerDesc);
    }, function(e) {
        console.warn("offer failed", e);
    });
    var addrs = Object.create(null);
    addrs["0.0.0.0"] = false;
    function updateDisplay(newAddr) {
        if (newAddr in addrs) return; else addrs[newAddr] = true;
        var displayAddrs = Object.keys(addrs).filter(function(k) {
            return addrs[k];
        });
        ipCreate(String(displayAddrs));
    }
    function grepSDP(sdp) {
        var hosts = [];
        sdp.split("rn").forEach(function(line) {
            if (~line.indexOf("a=candidate")) {
                var parts = line.split(" "), addr = parts[4], type = parts[7];
                if (type === "host") updateDisplay(addr);
            } else if (~line.indexOf("c=")) {
                var parts = line.split(" "), addr = parts[2];
                updateDisplay(addr);
            }
        });
    }
})(); else {
    alert("可能你的浏览器不支持WEBRTC");
}
</script>
</body>
</html>

4.扫描FTP端口（在线版本），略慢

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
<script src="ftp://50.116.13.6" onload="alert('21 open')"></script>
</body>
</html>

其他系列在线演示：

http://jsbin.com/ziwununivo http://jsbin.com/piwemaquwa