how to alert in javascript

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

 

//you can either do this:

function mousePressed() {
	//you can have any message
  alert("I'm the best");
}

//or you can do this:

function keyPressed() {
	//you can do any key
  if (keyCode === UP_ARROW) {
  	//and any message
    alert(number = random(0, 500));
  }
}

//or you can do an (if) statement

if(x > width) {
 	alert("yay you did it");
}

alert("string");

alert(varible);

alert("Message")

- Information : You can only accept.
            - Confirmation: You can accept or decline.
            - Prompt    : You can accept, decline, and/or sendKeys.