cordova 点击退出

document.addEventListener("deviceready", onDeviceReady, false);

function onDeviceReady() {
//navigator.splashscreen.hide();
document.addEventListener("backbutton", onBackKeyDown, false);
}
function onBackKeyDown() {
Toast.showShort('再点击一次退出!');
document.removeEventListener("backbutton", onBackKeyDown, false); // 注销返回键
document.addEventListener("backbutton", exitApp, false);//绑定退出事件
// 3秒后从新注册
var intervalID = window.setInterval(function() {
window.clearInterval(intervalID);
document.removeEventListener("backbutton", exitApp, false); // 注销返回键
document.addEventListener("backbutton", onBackKeyDown, false); // 返回键
}, 3000);
}
function exitApp(){
navigator.app.exitApp();
}