How to copy js to clipboard instance

Copy codeThe Code is as follows:
<Script type = "text/javascript" language = "javascript">
// Copy the js Code to the clipboard
Function copyToClipBoard (s ){
// Alert (s );
If (window. clipboardData ){
Window. clipboardData. setData ("Text", s );
Alert ("copied to clipboard! "+" \ N "+ s );
} Else if (navigator. userAgent. indexOf ("Opera ")! =-1 ){
Window. location = s;
} Else if (window. netscape ){
Try {
Netscape. security. PrivilegeManager. enablePrivilege ("UniversalXPConnect ");
} Catch (e ){
Alert ("rejected by the browser! \ N enter 'about: config' in the address bar of the browser, press enter \ n, and set 'signed. applets. codebase_principal_support 'to 'true '");
}
Var clip = Components. classes ['@ mozilla.org/widget/clipboard=1'mirror.createinstance (Components. interfaces. nsIClipboard );
If (! Clip)
Return;
Var trans = Components. classes ['@ mozilla.org/widget/transferable00001').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 = s;
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 );
Alert ("copied to clipboard! "+" \ N "+ s)
}
} </Script>