alert with yes and no js code example

Example 1: javascript confirm yes no

var proceed = confirm("Are you sure you want to proceed?");
if (proceed) {
  //proceed
} else {
  //don't proceed
}

Example 2: js alert yes no

if (confirm('Are you sure you want to donate to Andrew Hyder?')) {
  // true (paypal.me/andrewdhyder)
} else {
  // false
}