JSFiddle - React, Tailwind, and code Playground
HTML
<a id="goog" onclick="return togooglepage()" href="#">Google.com</a> <br/>
<a id="yahoo" onclick="return toyahoopage()" href="#">Yahoo.com</a> <br/>
JavaScript
function warning(){
if(true){
return "You are leaving the page";
}
}
window.onbeforeunload = warning;
function togooglepage()
{
window.location = "www.google.co.in";
}
function toyahoopage()
{
window.location = "www.yahoo.com";
}