Adding Cancel Button to Javascript Alert

Question

Here is my Javascript Alert:

<script>
function showMessage() {
    setTimeout(function() {
alert("alert");
}, 100);
}
</script>

When a user visits a page, a window pops up that says "alert" and it only has the "Ok" button. When it is clicked, the window goes away and displays the page under it. How do I add a "Cancel" button that has the same effect?

Answer 1

Well you can use window.confirm

confirm("alert");

The above returns true or false based on the selection.