怎么测试_timing里面的lastDay有什么东西？用apipost调用也不行

//globalDaysData有数据  
async _timing(param) {  
            if (!globalDaysData) {  
              console.log('daysData 未初始化');   
              return new useResult(404, "daysData not initialized");  
            }  
            const lastDay = globalDaysData[globalDaysData.length - 1];  
            console.log('lastDay是', lastDay);     
            return lastDay  
}