让phonegap 回来键后按 确定才退出应用

让phonegap 返回键后按 确定才退出应用!

?document.addEventListener("deviceready", onDeviceReady, false);
?
?// PhoneGap is loaded and it is now safe to make calls PhoneGap methods
?function onDeviceReady() {
??// 注册回退按钮事件监听器
??document.addEventListener("backbutton", onBackKeyDown, false); //返回键
?}?
?
?
?function onConfirm(button) {
??????? //alert('You selected button ' + button);
??if(button==1) navigator.app.exitApp(); //选择了确定才执行退出

??? }

??? // Show a custom confirmation dialog
??? //
??? function onBackKeyDown() {
??????? navigator.notification.confirm(
??????????? '按确定退出程序!',? // message
??????????? onConfirm,????????????? // callback to invoke with index of button pressed
??????????? '确定要退出程序吗?',??????????? // title
??????????? '确定,取消'????????? // buttonLabels
??????? );
??? }