function second(second) { let obj = { day: Math.floor(second / 60 / 60 / 24), hour: Math.floor(second / 60 / 60 % 24), min: Math.floor(second / 60 % 60), second: second % 60 } return obj; } function render(data) { let wrapper = document.querySelector('#jsCountdown'); for (let i in data) { data[i] = data[i] > 9 ? data[i] : '0' + data[i]; } if (data.day === '00') { wrapper.children[0].classList.add('hide'); } else { wrapper.children[0].innerHTML = data.day + '天'; } wrapper.children[1].innerHTML = data.hour + ':'; wrapper.children[2].innerHTML = data.min + ':'; wrapper.children[3].innerHTML = data.second; }