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Popups do Javascript

Alert

window.alert("sometext");

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

Confirm

window.confirm("sometext");

if (confirm("Press a button!")) {
  txt = "You pressed OK!";
} else {
  txt = "You pressed Cancel!";
} 

Prompt

window.prompt("sometext","defaultText");

var person = prompt("Please enter your name", "Harry Potter");

if (person == null || person == "") {
  txt = "User cancelled the prompt.";
} else {
  txt = "Hello " + person + "! How are you today?";
} 

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