window.onbeforeunload not showing messages in chrome

Question

当用户试图离开时，我在某些情况下显示了一条警报消息。该消息显示在Safari中，但在Chrome中不起作用。
我尝试了两件事，例如以下内容：

window.onbeforeunload = function(event) {
    if ($scope.isFormChanged == true) {
        event.returnValue = 'Don't go yet! Save your changed data before you leave!';
    }
}
    window.onbeforeunload = function() {
        if ($scope.isFormChanged == true) {
            return 'Don't go yet! Save your changed data before you leave!'
        }
    }

Answer 1

我认为这在chrome中有效。我也怀疑Isformchanged。

<script type="text/javascript"> window.onbeforeunload = function() { return "Are you sure you want to close window?" } </script>