How to change custom message in alert box

Question

How to change custom message in alert box by using hostlistner when page refreshing in angular

Answer 1

Am trying to change a custom message to alert message I tried below code

@HostListener("window:beforeunload", 
["$event"]) 
unloadHandler(event:Event) {
let result = confirm("Changes you 
made may not be saved.");
if (result) {
}
event.returnValue = false; 
}