我想在用户关闭弹出窗口时显示警报

Question

I want to show a popup (Google, Twitter etc) and when users close that dialog, I want to show an alert "bye", but that alert does not appear:

<script>
var openDialog = function(uri, name, options, closeCallback) {
var win = window.open(uri, name, options);
var interval = window.setInterval(function() {
    try {
        if (win == null || win.closed) {
            window.clearInterval(interval);
            closeCallback(win);
        }
    }
    catch (e) {
    }
}, 1000);
return win;
};
var test = function() {
alert("bye");
};

openDialog("//google.com", "popup", "scrollbars=no", "test");
</script>

Answer 1

Change this code

openDialog("//google.com", "popup", "scrollbars=no", "test");

with that:

openDialog("//google.com", "popup", "scrollbars=no", test);

Demo: http://jsfiddle.net/3on19uak/

Answer 2

This line:

 openDialog("//google.com", "popup", "scrollbars=no", "test");

Should read:

 openDialog("//google.com", "popup", "scrollbars=no", test);

if you wanted you could also do:

 openDialog("//google.com", "popup", "scrollbars=no", function(e){
    alert("bye");
 });