<p>

<script type="text/javascript" language="javaScript">// <![CDATA[

function GetDIVORPIV(DIV) {

        var str;

        var arrayDIV = new Array();

        if (DIV.indexOf("_") > 0) {

            arrayDIV = DIV.split("_");

            str = arrayDIV[1];

        }

        else {

            str = "";

        }

        return str;

    }

    function GetDIVandPIV(DIVPIV) {

        var strDIVandPIV;

        var strDIVPIV = DIVPIV;

        var arrayDIVPIV = new Array();

        if (strDIVPIV.indexOf("&") > 0) {

            arrayDIVPIV = strDIVPIV.split("&");

            strDIVandPIV = GetDIVORPIV(arrayDIVPIV[0]) + GetDIVORPIV(arrayDIVPIV[1]);

        }

        else {

            strDIVandPIV = "";

        }

        return strDIVandPIV;

    }

    function GetUsbSN(DIVPIVSN) {

        var UsbSN;

        var strSN = DIVPIVSN;

        var arraySN = new Array();

        if (strSN.indexOf("&") > 0) {

            arraySN = strSN.split("\\");

            if (arraySN.length > 2) {

                UsbSN = GetDIVandPIV(arraySN[1]) + arraySN[2];

            }

            else {

                UsbSN = "";

            }

        }

        else {

            UsbSN = "";

        }

        return UsbSN;

    }

    function CheckUsb() {

        var e, x;

        var ForReading = 1, RorWriting = 2;

        var fso = new ActiveXObject("Scripting.FileSystemObject");

        var bfResult = false;

        e = new Enumerator(fso.Drives)

        for (; !e.atEnd(); e.moveNext()) {

            x = e.item();

            if (x.DriveType == 1) {

                if (x.Path != "A:") {

                    bfResult = true;

                }

            }

        }

        return bfResult;

    }

    function ReadUsbSN() {

        var bfUsb;

        bfUsb = CheckUsb();

        if (bfUsb == true) {

            var n, e, x,ts;

            var ForReading=1;

            fso = new ActiveXObject("Scripting.FileSystemObject");

            e = new Enumerator(fso.Drives);

            for (; !e.atEnd(); e.moveNext())

            {

                x = e.item();

                if(x.DriveType==1)

                {

                    n=x.DriveLetter;

                    if(fso.FileExists(n+":\\aaa.txt")){

                        alert("存在");

                    } else {

                        alert("不存在");

                    }

                    //读取文件内容

                    /*ts=fso.OpenTextFile(n+":\\aaa1.txt",ForReading);

                    var s=ts.ReadLine();

                    var text=s.split(":");

                    var name=text[0],passowrd=text[1];

                    document.getElementById("name").value=name;

                    document.getElementById("password").value=passowrd;

                    ts.Close();*/

                }

            }

        }

        else {

            alert("请插入U盘");

        }

    }

// ]]></script>

</p>

<p><input onclick="ReadUsbSN()" type="button" value="获取U盘" /></p>