Problem scenario
You want to read input and assign it as a variable in JavaScript. What should you do?
Solution
Create a .html file, saved directly on your desktop or in a /var/www/html/ directory on a web server, with the follow content to illustrate how to do this (then open it in a web browser):
<!DOCTYPE html>
<html>
<body>
<h2>Use JavaScript to Change Text</h2>
<p>This example writes "Hello in JavaScript from Continualintegration.com!" into an HTML element with id="demo":</p>
<p id="demo"></p>
<script>
var foo = prompt("Please enter input and press enter");
alert(foo)
</script>
</body>
</html>