Javascript 使用JSFIDLE检查代码（有没有提供访问服务器的凭据的方法？要测试 function loadFile() { alert("loading file"); gform.MOJWebTwain.HTTPPort = 9080; gform.MOJWebTwain.IfSSL = false; var result = gform.MOJWebTwain.HTTPDownload('myServer', existingDocumentPath); alert("result: "+result); var errorString = gform.MOJWebTwain.ErrorString; var errorCode = gform.MOJWebTwain.ErrorCode; if (!result) { alert("errorString: " + errorString); alert("errorCode " + errorCode); } document.body.style.opacity="100"; } window.onload = function () { var DW_DWTContainerID = "gform:scan_area"; var DW_FULLCLASSID = "123456-abcdef-12345-abcdef-123456"; // fixed var DW_PROCLASSID = "3d25aba1-abcdef-12345-abcdef-123456"; // the one in lpk file var DW_VersionCode = "6,3,1,0"; var DW_InWindowsX86; var objString = ""; var DW_ObjectName="MOJWebTwain" var DW_Width = 400; var DW_Height = 400; var DW_CABX86Path = "DynamSoft/DynamicWebTWAIN.cab"; var DW_CABX64Path = "DynamSoft/DynamicWebTWAINx64.cab"; var LPK_Path = "DynamSoft/DynamicWebTwain.lpk"; ua = (navigator.userAgent.toLowerCase()); objString += "<object id='" + DW_ObjectName + "' "+"width='" + DW_Width +" ' "+"height='" + DW_Height+"' "; if (DW_InWindowsX86) objString += "codebase='" + DW_CABX86Path + "#version=" + DW_VersionCode + "' "; else objString += "codebase='" + DW_CABX64Path + "#version=" + DW_VersionCode + "' "; objString += " classid='clsid:" + DW_FULLCLASSID + "' viewastext>"; //alert("objString: "+objString); objString += " <param name='_cx' value='847'/>"; objString += " <param name='_cy' value='847'/>"; objString += " <param name='JpgQuality' value='30'/>"; objString += " <param name='Manufacturer' value='DynamSoft Corporation'/>"; objString += " <param name='ProductFamily' value='Dynamic Web TWAIN'/>"; objString += " <param name='ProductName' value='Dynamic Web TWAIN'/>"; objString += " <param name='VersionInfo' value='Dynamic Web TWAIN 6,3,1,0'/>"; objString += " <param name='TransferMode' value='0'/>"; objString += " <param name='BorderStyle' value='0'/>"; objString += " <param name='FTPUserName' value=''/>"; objString += " <param name='FTPPassword' value=''/>"; objString += " <param name='FTPPort' value='21'/>"; objString += " <param name='HTTPUserName' value=''/>"; objString += " <param name='HTTPPassword' value=''/>"; objString += " <param name='HTTPPort' value='9080' />"; objString += " <param name='ProxyServer' value=''/>"; objString += " <param name='IfDisableSourceAfterAcquire' value='0'/>"; objString += " <param name='IfShowUI' value='0'/>"; objString += " <param name='IfModalUI' value='-1'/>"; objString += " <param name='IfTiffMultiPage' value='-1'/>"; objString += " <param name='IfThrowException' value='0'/>"; objString += " <param name='MaxImagesInBuffer' value='99'/>"; objString += " <param name='TIFFCompressionType' value='0'/>"; objString += " <param name='IfFitWindow' value='-1' />"; objString += " <param name='IfSSL' value='0' />"; objString += " </object>"; var obj2String = "<object " +"classid='clsid:"+DW_PROCLASSID+"'"+">" +"<param name='LPKPath' value='"+LPK_Path+"'"+"/>"; +"</object>"; //alert("obj2String "+obj2String); var obj2String = "<object classid='clsid:"+DW_PROCLASSID+"'>" +"<param name='LPKPath' value='"+LPK_Path+"'"+"/>"; +"</object>"; var objects_string=obj2String +" "+objString; DWTContainer = document.getElementById(DW_DWTContainerID); DWTContainer.innerHTML = objects_string; setInterval(function(){loadFile()},1000); // this will delay it by a second just in case some other instructions should be done ... } 函数加载文件（）{ 警报（“加载文件”）； gform.MOJWebTwain.HTTPPort=9080； gform.MOJWebTwain.IfSSL=false； var result=gform.MOJWebTwain.HTTPDownload（'myServer'，existingDocumentPath）； 警报（“结果：+结果”）； var errorString=gform.MOJWebTwain.errorString； var errorCode=gform.MOJWebTwain.errorCode； 如果（！结果）{ 警报（“errorString:+errorString”）； 警报（“错误代码”+错误代码）； } document.body.style.opacity=“100”； } window.onload=函数（）{ var DW_DWTContainerID=“gform:scan_area”； var DW_FULLCLASSID=“123456-abcdef-12345-abcdef-123456”//已修复 var DW_PROCLASSID=“3d25aba1-abcdef-12345-abcdef-123456”//lpk文件中的那个 var DW_VersionCode=“6,3,1,0”； Windowsx86中的var DW_； var objString=“”； var DW_ObjectName=“MOJWebTwain” var DW_宽度=400； var DW_高度=400； var DW_CABX86Path=“DynamSoft/DynamicWebTWAIN.cab”； var DW_CABX64Path=“DynamSoft/DynamicWebTWAINx64.cab”； var LPK_Path=“DynamSoft/DynamicWebTwain.LPK”； ua=（navigator.userAgent.toLowerCase（））； 对象字符串+=“”； //警报（“对象字符串：+objString”）； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； 对象字符串+=“”； var obj2String=“” +""; +""; //警报（“obj2String”+obj2String）； var obj2String=“” +""; +""; var objects_string=obj2String+“”+objString； DWTContainer=document.getElementById（DW_DWTContainerID）； DWTContainer.innerHTML=对象\字符串； setInterval（function（）{loadFile（）}，1000）；//这将延迟一秒钟，以防需要执行其他指令。。。 }

@Mahmoud请尝试下面的代码，我无法使用Jsfiddle检查您的代码（是否有方法提供访问服务器的凭据？以进行测试

function loadFile() {
    alert("loading file");
    gform.MOJWebTwain.HTTPPort = 9080;
    gform.MOJWebTwain.IfSSL = false;
    var result = gform.MOJWebTwain.HTTPDownload('myServer', existingDocumentPath);
    alert("result: "+result);
    var errorString = gform.MOJWebTwain.ErrorString;
    var errorCode = gform.MOJWebTwain.ErrorCode;
    if (!result) {
        alert("errorString: " + errorString);
        alert("errorCode " + errorCode);
    }
    document.body.style.opacity="100";

}

window.onload = function () {
var DW_DWTContainerID = "gform:scan_area";
var DW_FULLCLASSID = "123456-abcdef-12345-abcdef-123456"; // fixed
var DW_PROCLASSID = "3d25aba1-abcdef-12345-abcdef-123456";  // the one in lpk file

var DW_VersionCode = "6,3,1,0";
var DW_InWindowsX86;
var objString = "";

var DW_ObjectName="MOJWebTwain"
var DW_Width = 400;
var DW_Height = 400;
var DW_CABX86Path = "DynamSoft/DynamicWebTWAIN.cab";
var DW_CABX64Path = "DynamSoft/DynamicWebTWAINx64.cab";
var LPK_Path = "DynamSoft/DynamicWebTwain.lpk";
ua = (navigator.userAgent.toLowerCase());

objString += "<object id='" + DW_ObjectName + "' "+"width='" + DW_Width +" ' "+"height='" + DW_Height+"' ";

if (DW_InWindowsX86) objString += "codebase='" + DW_CABX86Path + "#version=" + DW_VersionCode + "' ";
else objString += "codebase='" + DW_CABX64Path + "#version=" + DW_VersionCode + "' ";

objString += " classid='clsid:" + DW_FULLCLASSID + "' viewastext>";

//alert("objString: "+objString);

objString += " <param name='_cx' value='847'/>";
objString += " <param name='_cy' value='847'/>";
objString += " <param name='JpgQuality' value='30'/>";
objString += " <param name='Manufacturer' value='DynamSoft Corporation'/>";
objString += " <param name='ProductFamily' value='Dynamic Web TWAIN'/>";
objString += " <param name='ProductName' value='Dynamic Web TWAIN'/>";
objString += " <param name='VersionInfo' value='Dynamic Web TWAIN 6,3,1,0'/>";
objString += " <param name='TransferMode' value='0'/>";
objString += " <param name='BorderStyle' value='0'/>";
objString += " <param name='FTPUserName' value=''/>";
objString += " <param name='FTPPassword' value=''/>";
objString += " <param name='FTPPort' value='21'/>";
objString += " <param name='HTTPUserName' value=''/>";
objString += " <param name='HTTPPassword' value=''/>";
objString += " <param name='HTTPPort' value='9080' />";
objString += " <param name='ProxyServer' value=''/>";
objString += " <param name='IfDisableSourceAfterAcquire' value='0'/>";
objString += " <param name='IfShowUI' value='0'/>";
objString += " <param name='IfModalUI' value='-1'/>";
objString += " <param name='IfTiffMultiPage' value='-1'/>";
objString += " <param name='IfThrowException' value='0'/>";
objString += " <param name='MaxImagesInBuffer' value='99'/>";
objString += " <param name='TIFFCompressionType' value='0'/>";
objString += " <param name='IfFitWindow' value='-1' />";
objString += " <param name='IfSSL' value='0' />";
objString += " </object>";

var obj2String = "<object "
    +"classid='clsid:"+DW_PROCLASSID+"'"+">"
    +"<param name='LPKPath' value='"+LPK_Path+"'"+"/>";
    +"</object>";

//alert("obj2String "+obj2String);

var obj2String = "<object classid='clsid:"+DW_PROCLASSID+"'>"
    +"<param name='LPKPath' value='"+LPK_Path+"'"+"/>";
    +"</object>";

var objects_string=obj2String +" "+objString;

DWTContainer = document.getElementById(DW_DWTContainerID);                          
DWTContainer.innerHTML = objects_string;

setInterval(function(){loadFile()},1000); // this will delay it by a second just in case some other instructions should be done ...
} 

函数加载文件（）{
警报（“加载文件”）；
gform.MOJWebTwain.HTTPPort=9080；
gform.MOJWebTwain.IfSSL=false；
var result=gform.MOJWebTwain.HTTPDownload（'myServer'，existingDocumentPath）；
警报（“结果：+结果”）；
var errorString=gform.MOJWebTwain.errorString；
var errorCode=gform.MOJWebTwain.errorCode；
如果（！结果）{
警报（“errorString:+errorString”）；
警报（“错误代码”+错误代码）；
}
document.body.style.opacity=“100”；
}
window.onload=函数（）{
var DW_DWTContainerID=“gform:scan_area”；
var DW_FULLCLASSID=“123456-abcdef-12345-abcdef-123456”//已修复
var DW_PROCLASSID=“3d25aba1-abcdef-12345-abcdef-123456”//lpk文件中的那个
var DW_VersionCode=“6,3,1,0”；
Windowsx86中的var DW_；
var objString=“”；
var DW_ObjectName=“MOJWebTwain”
var DW_宽度=400；
var DW_高度=400；
var DW_CABX86Path=“DynamSoft/DynamicWebTWAIN.cab”；
var DW_CABX64Path=“DynamSoft/DynamicWebTWAINx64.cab”；
var LPK_Path=“DynamSoft/DynamicWebTwain.LPK”；
ua=（navigator.userAgent.toLowerCase（））；
对象字符串+=“”；
//警报（“对象字符串：+objString”）；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
对象字符串+=“”；
var obj2String=“”
+"";
+"";
//警报（“obj2String”+obj2String）；
var obj2String=“”
+"";
+"";
var objects_string=obj2String+“”+objString；
DWTContainer=document.getElementById（DW_DWTContainerID）；
DWTContainer.innerHTML=对象\字符串；
setInterval（function（）{loadFile（）}，1000）；//这将延迟一秒钟，以防需要执行其他指令。。。
} 

根据Rachel的建议，您可以尝试以下方法：

function loadFile() {
    gform.MOJWebTwain.HTTPPort = 9080;
    gform.MOJWebTwain.IfSSL = false;
    var result = gform.MOJWebTwain.HTTPDownload('myServer', existingDocumentPath);
    alert("result: "+result);
    var errorString = gform.MOJWebTwain.ErrorString;
    var errorCode = gform.MOJWebTwain.ErrorCode;
    if (!result) {
        alert("errorString: " + errorString);
        alert("errorCode " + errorCode);
    }
    document.body.style.opacity="100";
}    

window.onload = function () {
    var DW_DWTContainerID = "gform:scan_area";
    var DW_FULLCLASSID = "123456-abcdef-12345-abcdef-123456"; // fixed
    var DW_PROCLASSID = "3d25aba1-abcdef-12345-abcdef-123456";  // the one in lpk file

    var DW_VersionCode = "6,3,1,0";
    var DW_InWindowsX86;
    var objString = "";

    var DW_ObjectName="MOJWebTwain"
    var DW_Width = 400;
    var DW_Height = 400;
    var DW_CABX86Path = "DynamSoft/DynamicWebTWAIN.cab";
    var DW_CABX64Path = "DynamSoft/DynamicWebTWAINx64.cab";
    var LPK_Path = "DynamSoft/DynamicWebTwain.lpk";
    ua = (navigator.userAgent.toLowerCase());
    if (ua.indexOf("win64") != -1 && ua.indexOf("x64") != -1)
        DW_InWindowsX86 = false;
    else
        DW_InWindowsX86 = true;
    objString += "<object id='" + DW_ObjectName + "' "+"width='" + DW_Width +" ' "+"height='" + DW_Height+"' ";

    if (DW_InWindowsX86) objString += "codebase='" + DW_CABX86Path + "#version=" + DW_VersionCode + "' ";
    else objString += "codebase='" + DW_CABX64Path + "#version=" + DW_VersionCode + "' ";

    objString += " classid='clsid:" + DW_FULLCLASSID + "' viewastext>";
    objString += " </object>"; 

    var obj2String = "<object "
        +"classid='clsid:"+DW_PROCLASSID+"'"+">"
        +"<param name='LPKPath' value='"+LPK_Path+"'"+"/>";
        +"</object>";

    var objects_string=obj2String +" "+objString;

    DWTContainer = document.getElementById(DW_DWTContainerID);                          
    DWTContainer.innerHTML = objects_string;
    DW_Seed;   // The seed used to detect the control.
    DW_Seed = setInterval(DW_ControlDetect, 500);

}
function DW_ControlDetect() {
    if (gform.MOJWebTwain.ErrorCode == 0) {
        loadFile();
    }
}

函数加载文件（）{
gform.MOJWebTwain.HTTPPort=9080；
gform.MOJWebTwain.IfSSL=false；
var result=gform.MOJWebTwain.HTTPDownload（'myServer'，existingDocumentPath）；
警报（“结果：+结果”）；
var errorString=gform.MOJWebTwain.errorString；
var errorCode=gform.MOJWebTwain.errorCode；
如果（！结果）{
警报（“errorString:+errorString”）；
警报（“错误代码”+错误代码）；
}
document.body.style.opacity=“100”；
}    
window.onload=函数（）{
var DW_DWTContainerID=“gform:scan_area”；
var DW_FULLCLASSID=“123456-abcdef-12345-abcdef-123456”//已修复
var DW_PROCLASSID=“3d25aba1-abcdef-12345-abcdef-123456”//lpk文件中的那个
var DW_VersionCode=“6,3,1,0”；
Windowsx86中的var DW_；
var objString=“”；
var DW_ObjectName=“MOJWebTwain”
var DW_宽度=400；
var DW_高度=400；
var DW_CABX86Path=“DynamSoft/DynamicWebTWAIN.cab”；
var DW_CABX64Path=“DynamSoft/DynamicWebTWAINx64.cab”；
var LPK_Path=“DynamSoft/DynamicWebTwain.LPK”；
ua=（navigator.userAgent.toLowerCase（））；
if（ua.indexOf（“win64”）！=-1和&ua.indexOf（“x64”）！=-1）
DW_InWindowsX86=false；
其他的
DW_InWindowsX86=true；
对象字符串+=“”；
对象字符串+=“”；
var obj2String=“”
+"";
+"";
var objects_string=obj2String+“”+objString；
DWTContainer=document.getElementById（DW_DWTContainerID）；
DWTContainer.innerHTML=对象\字符串；
DW_Seed；//用于检测控件的种子。
DW_Seed=设置间隔（DW_ControlDetect，500）；
}
函数DW_ControlDetect（）{
如果（gfo
window.onload = function (){
var DW_Seed;   // The seed used to detect the control.
DW_Seed = setInterval(DW_ControlDetect, 500);
}
function DW_ControlDetect() {
// If the ErrorCode is 0, it means the control is fully loaded.
if (DWObject.ErrorCode == 0) {
   // loadFile()...
}
}

window.onload = function(){

    var DW_DWTContainerID = "gform:scan_area";
    var DW_FULLCLASSID = "123456-abcdef-12345-abcdef-123456"; // fixed
    var DW_PROCLASSID = "3d25aba1-abcdef-12345-abcdef-123456";  // the one in lpk file

    var DW_VersionCode = "6,3,1,0";
    var DW_InWindowsX86;
    var objString = "";

    var DW_ObjectName="MOJWebTwain";
    var DW_Width = 400;
    var DW_Height = 400;
    var DW_CABX86Path = "DynamSoft/DynamicWebTWAIN.cab";
    var DW_CABX64Path = "DynamSoft/DynamicWebTWAINx64.cab";
    var LPK_Path = "DynamSoft/DynamicWebTwain.lpk";
    ua = (navigator.userAgent.toLowerCase());

    objString += "<object id='" + DW_ObjectName + "' "+"width='" + DW_Width +" ' "+"height='" + DW_Height+"' ";

    if (DW_InWindowsX86) objString += "codebase='" + DW_CABX86Path + "#version=" + DW_VersionCode + "' ";
    else objString += "codebase='" + DW_CABX64Path + "#version=" + DW_VersionCode + "' ";

    objString += " classid='clsid:" + DW_FULLCLASSID + "' viewastext>";

    //alert("objString: "+objString);

    objString += " <param name='_cx' value='847'/>";
    objString += " <param name='_cy' value='847'/>";
    objString += " <param name='JpgQuality' value='30'/>";
    objString += " <param name='Manufacturer' value='DynamSoft Corporation'/>";
    objString += " <param name='ProductFamily' value='Dynamic Web TWAIN'/>";
    objString += " <param name='ProductName' value='Dynamic Web TWAIN'/>";
    objString += " <param name='VersionInfo' value='Dynamic Web TWAIN 6,3,1,0'/>";
    objString += " <param name='TransferMode' value='0'/>";
    objString += " <param name='BorderStyle' value='0'/>";
    objString += " <param name='FTPUserName' value=''/>";
    objString += " <param name='FTPPassword' value=''/>";
    objString += " <param name='FTPPort' value='21'/>";
    objString += " <param name='HTTPUserName' value=''/>";
    objString += " <param name='HTTPPassword' value=''/>";
    objString += " <param name='HTTPPort' value='9080' />";
    objString += " <param name='ProxyServer' value=''/>";
    objString += " <param name='IfDisableSourceAfterAcquire' value='0'/>";
    objString += " <param name='IfShowUI' value='0'/>";
    objString += " <param name='IfModalUI' value='-1'/>";
    objString += " <param name='IfTiffMultiPage' value='-1'/>";
    objString += " <param name='IfThrowException' value='0'/>";
    objString += " <param name='MaxImagesInBuffer' value='99'/>";
    objString += " <param name='TIFFCompressionType' value='0'/>";
    objString += " <param name='IfFitWindow' value='-1' />";
    objString += " <param name='IfSSL' value='0' />";
    objString += " </object>";

    var obj2String = "<object classid='clsid:"+DW_PROCLASSID+"'>"+"<param name='LPKPath' value='"+LPK_Path+"'"+"/>"+"</object>";

    //alert("obj2String "+obj2String);

    /* var obj2String = "<object classid='clsid:"+DW_PROCLASSID+"'>"+"<param name='LPKPath' value='"+LPK_Path+"'"+"/>";
        +"</object>"; */

    var objects_string=obj2String +" "+objString;

    var DWTContainer = document.getElementById(DW_DWTContainerID);                          
    DWTContainer.innerHTML = objects_string;
    console.log(document.getElementsByName('FTPPassword')[0]);
    //loadFile();
};

function loadFile() {
    alert("loading file");
    gform.MOJWebTwain.HTTPPort = 9080;
    gform.MOJWebTwain.IfSSL = false;
    var result = gform.MOJWebTwain.HTTPDownload('myServer', existingDocumentPath);
    alert("result: "+result);
    var errorString = gform.MOJWebTwain.ErrorString;
    var errorCode = gform.MOJWebTwain.ErrorCode;
    if (!result) {
        alert("errorString: " + errorString);
        alert("errorCode " + errorCode);
    }
    document.body.style.opacity="100";

}

window.onload = function () {
var DW_DWTContainerID = "gform:scan_area";
var DW_FULLCLASSID = "123456-abcdef-12345-abcdef-123456"; // fixed
var DW_PROCLASSID = "3d25aba1-abcdef-12345-abcdef-123456";  // the one in lpk file

var DW_VersionCode = "6,3,1,0";
var DW_InWindowsX86;
var objString = "";

var DW_ObjectName="MOJWebTwain"
var DW_Width = 400;
var DW_Height = 400;
var DW_CABX86Path = "DynamSoft/DynamicWebTWAIN.cab";
var DW_CABX64Path = "DynamSoft/DynamicWebTWAINx64.cab";
var LPK_Path = "DynamSoft/DynamicWebTwain.lpk";
ua = (navigator.userAgent.toLowerCase());

objString += "<object id='" + DW_ObjectName + "' "+"width='" + DW_Width +" ' "+"height='" + DW_Height+"' ";

if (DW_InWindowsX86) objString += "codebase='" + DW_CABX86Path + "#version=" + DW_VersionCode + "' ";
else objString += "codebase='" + DW_CABX64Path + "#version=" + DW_VersionCode + "' ";

objString += " classid='clsid:" + DW_FULLCLASSID + "' viewastext>";

//alert("objString: "+objString);

objString += " <param name='_cx' value='847'/>";
objString += " <param name='_cy' value='847'/>";
objString += " <param name='JpgQuality' value='30'/>";
objString += " <param name='Manufacturer' value='DynamSoft Corporation'/>";
objString += " <param name='ProductFamily' value='Dynamic Web TWAIN'/>";
objString += " <param name='ProductName' value='Dynamic Web TWAIN'/>";
objString += " <param name='VersionInfo' value='Dynamic Web TWAIN 6,3,1,0'/>";
objString += " <param name='TransferMode' value='0'/>";
objString += " <param name='BorderStyle' value='0'/>";
objString += " <param name='FTPUserName' value=''/>";
objString += " <param name='FTPPassword' value=''/>";
objString += " <param name='FTPPort' value='21'/>";
objString += " <param name='HTTPUserName' value=''/>";
objString += " <param name='HTTPPassword' value=''/>";
objString += " <param name='HTTPPort' value='9080' />";
objString += " <param name='ProxyServer' value=''/>";
objString += " <param name='IfDisableSourceAfterAcquire' value='0'/>";
objString += " <param name='IfShowUI' value='0'/>";
objString += " <param name='IfModalUI' value='-1'/>";
objString += " <param name='IfTiffMultiPage' value='-1'/>";
objString += " <param name='IfThrowException' value='0'/>";
objString += " <param name='MaxImagesInBuffer' value='99'/>";
objString += " <param name='TIFFCompressionType' value='0'/>";
objString += " <param name='IfFitWindow' value='-1' />";
objString += " <param name='IfSSL' value='0' />";
objString += " </object>";

var obj2String = "<object "
    +"classid='clsid:"+DW_PROCLASSID+"'"+">"
    +"<param name='LPKPath' value='"+LPK_Path+"'"+"/>";
    +"</object>";

//alert("obj2String "+obj2String);

var obj2String = "<object classid='clsid:"+DW_PROCLASSID+"'>"
    +"<param name='LPKPath' value='"+LPK_Path+"'"+"/>";
    +"</object>";

var objects_string=obj2String +" "+objString;

DWTContainer = document.getElementById(DW_DWTContainerID);                          
DWTContainer.innerHTML = objects_string;

setInterval(function(){loadFile()},1000); // this will delay it by a second just in case some other instructions should be done ...
} 

function loadFile() {
    gform.MOJWebTwain.HTTPPort = 9080;
    gform.MOJWebTwain.IfSSL = false;
    var result = gform.MOJWebTwain.HTTPDownload('myServer', existingDocumentPath);
    alert("result: "+result);
    var errorString = gform.MOJWebTwain.ErrorString;
    var errorCode = gform.MOJWebTwain.ErrorCode;
    if (!result) {
        alert("errorString: " + errorString);
        alert("errorCode " + errorCode);
    }
    document.body.style.opacity="100";
}    

window.onload = function () {
    var DW_DWTContainerID = "gform:scan_area";
    var DW_FULLCLASSID = "123456-abcdef-12345-abcdef-123456"; // fixed
    var DW_PROCLASSID = "3d25aba1-abcdef-12345-abcdef-123456";  // the one in lpk file

    var DW_VersionCode = "6,3,1,0";
    var DW_InWindowsX86;
    var objString = "";

    var DW_ObjectName="MOJWebTwain"
    var DW_Width = 400;
    var DW_Height = 400;
    var DW_CABX86Path = "DynamSoft/DynamicWebTWAIN.cab";
    var DW_CABX64Path = "DynamSoft/DynamicWebTWAINx64.cab";
    var LPK_Path = "DynamSoft/DynamicWebTwain.lpk";
    ua = (navigator.userAgent.toLowerCase());
    if (ua.indexOf("win64") != -1 && ua.indexOf("x64") != -1)
        DW_InWindowsX86 = false;
    else
        DW_InWindowsX86 = true;
    objString += "<object id='" + DW_ObjectName + "' "+"width='" + DW_Width +" ' "+"height='" + DW_Height+"' ";

    if (DW_InWindowsX86) objString += "codebase='" + DW_CABX86Path + "#version=" + DW_VersionCode + "' ";
    else objString += "codebase='" + DW_CABX64Path + "#version=" + DW_VersionCode + "' ";

    objString += " classid='clsid:" + DW_FULLCLASSID + "' viewastext>";
    objString += " </object>"; 

    var obj2String = "<object "
        +"classid='clsid:"+DW_PROCLASSID+"'"+">"
        +"<param name='LPKPath' value='"+LPK_Path+"'"+"/>";
        +"</object>";

    var objects_string=obj2String +" "+objString;

    DWTContainer = document.getElementById(DW_DWTContainerID);                          
    DWTContainer.innerHTML = objects_string;
    DW_Seed;   // The seed used to detect the control.
    DW_Seed = setInterval(DW_ControlDetect, 500);

}
function DW_ControlDetect() {
    if (gform.MOJWebTwain.ErrorCode == 0) {
        loadFile();
    }
}

setTimeout(function(){
        DWTContainer = document.getElementById(DW_DWTContainerID);
        alert("DWTContainer: "+DWTContainer);
        DWTContainer.innerHTML = objects_string;
        loadFile(editWebScan,existingDocumentPath);
    }, 500);

<form id="gform">
  <div id=gform:scan_area""><!--quote error-->

   </div>
</form>

<script>
    function loadFile() {
        alert("loading file");
        gform.MOJWebTwain.HTTPPort = 9080;
        gform.MOJWebTwain.IfSSL = false;
        var result = gform.MOJWebTwain.HTTPDownload('myServer', existingDocumentPath);
        alert("result: " + result);
        var errorString = gform.MOJWebTwain.ErrorString;
        var errorCode = gform.MOJWebTwain.ErrorCode;
        if (!result) {
            alert("errorString: " + errorString);
            alert("errorCode " + errorCode);
        }
        document.body.style.opacity = "100";
    }

    window.onload = function() {
        var DW_DWTContainerID = "gform:scan_area";
        var DW_FULLCLASSID = "123456-abcdef-12345-abcdef-123456"; // fixed
        var DW_PROCLASSID = "3d25aba1-abcdef-12345-abcdef-123456";  // the one in lpk file

        var DW_VersionCode = "6,3,1,0";
        var DW_InWindowsX86;
        var objString = "";

        var DW_ObjectName = "MOJWebTwain";
        var DW_Width = 400;
        var DW_Height = 400;
        var DW_CABX86Path = "DynamSoft/DynamicWebTWAIN.cab";
        var DW_CABX64Path = "DynamSoft/DynamicWebTWAINx64.cab";
        var LPK_Path = "DynamSoft/DynamicWebTwain.lpk";
        ua = (navigator.userAgent.toLowerCase());

        objString += "<object id='" + DW_ObjectName + "' " + "width='" + DW_Width + " ' " + "height='" + DW_Height + "' ";

        if (DW_InWindowsX86)
            objString += "codebase='" + DW_CABX86Path + "#version=" + DW_VersionCode + "' ";
        else
            objString += "codebase='" + DW_CABX64Path + "#version=" + DW_VersionCode + "' ";

        objString += " classid='clsid:" + DW_FULLCLASSID + "' viewastext>";

        //alert("objString: "+objString);

        objString += " <param name='_cx' value='847'/>";
        objString += " <param name='_cy' value='847'/>";
        objString += " <param name='JpgQuality' value='30'/>";
        objString += " <param name='Manufacturer' value='DynamSoft Corporation'/>";
        objString += " <param name='ProductFamily' value='Dynamic Web TWAIN'/>";
        objString += " <param name='ProductName' value='Dynamic Web TWAIN'/>";
        objString += " <param name='VersionInfo' value='Dynamic Web TWAIN 6,3,1,0'/>";
        objString += " <param name='TransferMode' value='0'/>";
        objString += " <param name='BorderStyle' value='0'/>";
        objString += " <param name='FTPUserName' value=''/>";
        objString += " <param name='FTPPassword' value=''/>";
        objString += " <param name='FTPPort' value='21'/>";
        objString += " <param name='HTTPUserName' value=''/>";
        objString += " <param name='HTTPPassword' value=''/>";
        objString += " <param name='HTTPPort' value='9080' />";
        objString += " <param name='ProxyServer' value=''/>";
        objString += " <param name='IfDisableSourceAfterAcquire' value='0'/>";
        objString += " <param name='IfShowUI' value='0'/>";
        objString += " <param name='IfModalUI' value='-1'/>";
        objString += " <param name='IfTiffMultiPage' value='-1'/>";
        objString += " <param name='IfThrowException' value='0'/>";
        objString += " <param name='MaxImagesInBuffer' value='99'/>";
        objString += " <param name='TIFFCompressionType' value='0'/>";
        objString += " <param name='IfFitWindow' value='-1' />";
        objString += " <param name='IfSSL' value='0' />";
        objString += " </object>";

        var obj2String = "<object "
                + "classid='clsid:" + DW_PROCLASSID + "'" + ">"
                + "<param name='LPKPath' value='" + LPK_Path + "'" + "/>";
        +"</object>";

        //alert("obj2String "+obj2String);

        var obj2String = "<object classid='clsid:" + DW_PROCLASSID + "'>"
                + "<param name='LPKPath' value='" + LPK_Path + "'" + "/>";
        +"</object>";

        var objects_string = obj2String + " " + objString;
        console.log(objects_string);

        DWTContainer = document.getElementById(DW_DWTContainerID);
        DWTContainer.innerHTML = objects_string;

        loadFile();
    }
</script>

<form id="gform">
  <div id="gform:scan_area">

   </div>
</form>