JavaScript Verzweigung: If - then - else Einfaches If

Einfaches If

Beispiel 1:

let userName = prompt("What's your name?");
if (userName == "Manfred") {
    console.log("Hello " + userName + "! You are a godsend!");
} else {
    console.log("Hello " + userName + "! You are an ordinary user");
}

Beispiel 2:

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>JS-Demo</title>
    </head>
    <body>        
        <script>
            age = Number(prompt("Wie alt bist Du?"));
            if (age < 18) {
                alert("Sorry, no entry!");
            } else {
                alert("Hello, you are welcome!");
            }
        </script>
    </body>
</html>