重写Cordova的backbutton事件

代码块

    function onBackKeyDown() {
        navigator.notification.confirm(
            ‘你真的要狠心退出吗？‘,
            function (e) {
                if (e === 1)
                    navigator.app.exitApp();
            },
            ‘警告‘,
            [‘是的‘, ‘点错了‘]
        );
    }
    document.addEventListener(‘backbutton‘, onBackKeyDown, true);