Javascript - Callback Function

<script>

mine1 = 1;
mine2 = 2;

myAction (function() {
    alert(mine1+mine2);
});

function myAction(action) {
    action();
}
</script>


<script>

myAction(function(valFromFunc1, valFromFunc2) {
    alert(valFromFunc1+valFromFunc2);
});

function myAction(action) {
    x = 11;
    y = 12;
    action(x, y);
}
</script>

<script>
mine = 13;
myAction(mine, function(valFromFunc1, valFromFunc2) {
    alert(mine+valFromFunc1+valFromFunc2);
});

function myAction(cup, action) {
    x = 11;
    y = cup;
    action(x, y);
}
</script>