Copy a multi-browser & quot; to the clipboard & quot; javascript code

The Code is as follows, so it is not nonsense. It can be compatible with basically all mainstream browsers (IE, FF) and can be used in many places:
CopyToClipboard = function (txt ){
If (window. clipboardData ){
Window. clipboardData. clearData ();
Window. clipboardData. setData ("Text", txt );
} Else if (navigator. userAgent. indexOf ("Opera ")! =-1 ){
Window. location = txt;
} Else if (window. netscape ){
Try {
Netscape. security. PrivilegeManager. enablePrivilege ("UniversalXPConnect ");
} Catch (e ){
Alert ("your firefox security restrictions restrict you from performing clipboard operations. Open 'about: config' and set signed. applets. codebase_principal_support 'to true and then try again ");
Return false;
}
Var clip = Components. classes ['@ mozilla.org/widget/clipboard?1=].createinstance (Components. interfaces. nsIClipboard );
If (! Clip)
Return;
Var trans = Components. classes ['@ mozilla.org/widget/transferable1_1).createinstance (Components. interfaces. nsITransferable );
If (! Trans)
Return;
Trans. addDataFlavor ('text/unicode ');
Var str = new Object ();
Var len = new Object ();
Var str = Components. classes ["@ mozilla.org/supports-string1_1).createinstance (Components. interfaces. nsISupportsString );
Var copytext = txt;
Str. data = copytext;
Trans. setTransferData ("text/unicode", str, copytext. length * 2 );
Var clipid = Components. interfaces. nsIClipboard;
If (! Clip)
Return false;
Clip. setData (trans, null, clipid. kGlobalClipboard );
}
}