1// Alert used to display a message to the user.
2alert("Hello, World!"); // Displays Hello, World! to the user.
3// You can also use:
4window.alert("Hello, World!"); // Also displays Hello, World! to the user.

1<script>
2  alert('this is an alert');
3</script>

1
2 alert("Hello! I am an alert box!!");

1alert("this is the alert")

1//you can either do this:
2
3function mousePressed() {
4	//you can have any message
5  alert("I'm the best");
6}
7
8//or you can do this:
9
10function keyPressed() {
11	//you can do any key
12  if (keyCode === UP_ARROW) {
13  	//and any message
14    alert(number = random(0, 500));
15  }
16}
17
18//or you can do an (if) statement
19
20if(x > width) {
21 	alert("yay you did it");
22}

1alert("Message")