How to use the schedule.every function in schedule

if (typeof(Number.prototype.toRad) === 'undefined') {
  Number.prototype.toRad = function() {
    return this * (Math.PI / 180);
  }
}

// Prime the station list on startup and read periodically
loadStationList();
every('24h').do(function() {
	loadStationList();
});

// Prime the elevator status on startup and read periodically
loadElevatorStatus();
every('15m').do(function() {
	loadElevatorStatus();
});

app.use(cors());
app.use('/', router);
app.listen(port);
console.log('BART API Server listening on port ' + port);

router.route(apiContext + '/elevatorStatus').get(
	function(request, response) {
		response.jsonp(infoCache.getElevatorStatus());
	}
);

if (typeof(Number.prototype.toRad) === 'undefined') {
  Number.prototype.toRad = function() {
    return this * (Math.PI / 180);
  }
}

// Prime the station list on startup and read periodically
loadStationList();
every('24h').do(function() {
	loadStationList();
});

// Prime the elevator status on startup and read periodically
loadElevatorStatus();
every('15m').do(function() {
	loadElevatorStatus();
});

app.use(cors());
app.use('/', router);
app.listen(port);
console.log('BART API Server listening on port ' + port);

});
        }).on('error', function() {
            console.log("[error] Get data error!");
            message = {
                'stat': 'fail',
                'msg': 'Get data error!'
            }
            res.send(200, message);
            return false;
        });
    });

    /**
     * 启动定时任务
     */
    every(config.emailTimes).do(function() {
        getMessageModule(url);
    });
}

//获取到数据 source，我们可以对数据进行操作了!
        res.on('end', function() {
            //console.log(source);
            var $ = cheerio.load(source);
            var currentData = $("center").html();
            sentMailModule(currentData);
        });
    }).on('error', function() {
        console.log("获取数据出现错误");
    });
}

/**
 * 启动定时任务
 */
every('2s').do(function() {
    getMessageModule(url);
});

GitlabLdapGroupSync.prototype.startScheduler = function (interval) {
  this.stopScheduler();
  ins = every(interval).do(this.sync);
}