iframe框架中用js改变父级Url

<script type="text/javascript">
        var path = window.location.href;//当前也面的跳转
        var topPath = top.window.location.href;//最外层也面的跳转
        if (path != topPath)
        {
            top.window.location.href = window.location.href;
        }
    </script>