$ionicPlatform.registerBackButtonAction(function (e){
    //阻止默认的行为
    e.preventDefault();
    // 退出提示框
    function showConfirm() {
     var servicePopup = $ionicPopup.show({
      title: '提示',
      subTitle: '你确定要退出应用吗？',
      scope: $rootScope,
      buttons: [
       {
        text: '取消',
        type: 'button-clear button-assertive',
        onTap: function () {
         return 'cancel';
        }
       },
       {
        text: '确认',
        type: 'button-clear button-assertive border-left',
        onTap: function (e) {
         return 'active';
        }
       },
      ]
     });
     servicePopup.then(function (res) {
      if (res == 'active') {
       // 退出app
       ionic.Platform.exitApp();
      }
     });
    }
     // 判断当前路由是否为各个导航栏的首页，是的话则显示提示框
    if ($location.path() == '/index' || $location.path() == '/product' || $location.path() == '/account' || $location.path() == '/more') {
     showConfirm();
    } else if ($ionicHistory.backView()) {
     $ionicHistory.goBack();
    } else {
     showConfirm();
    }
    return false;
   }, 101); //101优先级常用于覆盖‘返回上一个页面'的默认行为