Answer 1

The¥AIRWeb
try this:

alert("Designed by Air Philippines");
var user = prompt("Name");
confirm(user);
var passed = false
var email = prompt("Email");
while(passed===false){
if (email!=null && email.includes("@")){
passed = true
confirm(email);
alert("Thanks!");
}
else if(email===null){
break
}
else{
email = prompt("Invalid. Please include @ ")
}
}
console.log(.......)

Answer 2

The¥AIRWeb
how about this?

alert("Designed by Air Philippines");
var user = prompt("Name");
confirm(user);
var passed = false
while(passed===false){
var email = prompt("Email");
if (email.includes("@")){
passed = true
confirm(email);
alert("Thanks!");
}
else{
email = prompt("Invalid. Please include @ ")
}
}
console.log(.......)

Answer 3

Window prompt()

https://www.w3schools.com/jsref/met_win_prompt.asp

Window confirm()

https://www.w3schools.com/jsref/met_win_confirm.asp

Answer 4

You can't use else if without if.

Answer 5

var user = prompt("Name");

if (user == null) {
alert("Please enter your name");
}

Answer 6

the error occurs when you click the cancel button, which returns null and assigns null to email.

Answer 7

The¥AIRWeb your code doesn't have an if statement. You can't use an else if statement without first using an if statement.
https://www.w3schools.com/js/js_if_else.asp
https://www.javascripttutorial.net/javascript-if-else-if/
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/if...else

Answer 8

You don't need else... If

Just one condition and one counter condition so use if... else

Answer 9

Use if else ....
For better validation