//退出APP
  function exitNowApp(){
    $api.setStorage('isFullScreen',0);
    //按兩次退出應用
    api.addEventListener({
      name : 'keyback'
    }, function(ret, err) {
      //全屏時 需要傳送事件 並關閉全屏
      var isFullScreen = $api.getStorage('isFullScreen');
      console.log("isFullScreen"+isFullScreen);
      //如果全屏 只關閉全屏
      if(isFullScreen == '1'){
        api.sendEvent({
            name: 'clickhome',
            extra: {}
        });
      }else{
        api.toast({
          msg : '再點一次退出應用',
          duration : 2000,
          location : 'bottom'
        });
        api.addEventListener({
          name : 'keyback'
        }, function(ret, err) {
          if($api.getStorage('isFullScreen' == "0")){
            api.sendEvent({
                name: 'clickhome',
                extra: {}
            });
          }else{
            api.closeWidget({
              silent : true
            });
          }

        });
      }

      setTimeout(function() {
      }, 2000)
    });
 }