The confirm() method displays a dialog box with a specified message, along with an OK and a Cancel button.
Boolean=window.confirm(String DisplayText) ;
Boolean=window.confirm(String MessageId,String DisplayText);
Boolean=window.confirm(String MessageId,String DisplayText,Object PlaceHolder);
window.confirm("Continue?");
You can use this command without window prefix
let a=confirm("Continue?");
if(a==true) alert("We continue!");
If you define the Message Id, the system use the text from Message translation system
let a=confirm("deleteEntry","Delete Entry?")
Working with Placeholder
Messages support place holders in text <placeholder>
let quantity=10.3;
// Message mrpminordr33 (Standard is german) has placeholder "menge", which present the quantity
// we convert the quantity Number to quantity string for Unit Pcs and replace the place holder in translated text
let r=confirm("mrpminordr33",
"Mindestbestellmenge ist auf <menge> gesetzt. Soll die Eingabe hochgesetzt werden?",{menge:quantity.toString("Pcs")} );
if (r==true) {
// calculate ...
}

Server mode:
In server mode the function return always true and don't display a message