node-webkit Window 监听不到事件

我看这个node-webkit 教程,这个视频在解决自定义最大化最小化的时候用window.on(‘maximize’)监听窗口的变化,但是Window的监听函数好像都没有监听到,使得最大化以后不能恢复,不知道为什么,我把源码复制下来还是一样的,一开始我以为是API变了,但是还是没发现什么不同,window.on(‘minimize’)还是没发现能监听成功,-是最小化,o最大化,x是关闭,求助:

<!DOCTYPE html>
<html>
    <head>
        <title>Turbo</title>
        <script>

            var nw = require('nw.gui');
            var win = nw.Window.get();
            win.isMaximized = false;

        </script>

    </head>
    <body>

        <header>
            <ul>
                <li><a href='#' title='Minimize' id='windowControlMinimize'>-</a></li><!--
                --><li><a href='#' title='Maximize' id='windowControlMaximize'>o</a></li><!--
                --><li><a href='#' title='Close'    id='windowControlClose'   >x</a></li>
            </ul>
        </header>

        <script>

        // Min
        document.getElementById('windowControlMinimize').onclick = function()
        {
            win.minimize();
        };

        // Close
        document.getElementById('windowControlClose').onclick = function()
        {
            win.close();
        };

        // Max
        document.getElementById('windowControlMaximize').onclick = function()
        {
            if (win.isMaximized)
                win.unmaximize();
            else
                win.maximize();
        };

        // Listen to the minimize event
        win.on('minimize', function() {
              console.log('Window is minimized');
        });

        win.on('maximize', function(){
            win.isMaximized = true;
        });

        win.on('unmaximize', function(){
            win.isMaximized = false;
        });


        </script>

    </body>
</html>