爱站程序员基地代码：
<!DOCTYPE html><html lang=\"en\"><head><meta charset=\"UTF-8\"><meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\"><title>Document</title><style>* {margin: 0;padding: 0;}.box {width: 1000px;height: 300px;margin: 200px auto;padding-bottom: 50px;background: url(images/bg-1.jpg) no-repeat;}.box span {display: inline-block;width: 196px;height: 100px;color: #0ce6d3;font-size: 50px;line-height: 100px;text-align: center;/* margin: 0 50px; */}.box .dao {display: inline-block;width: 1000px;height: 200px;line-height: 200px;}.box1 {width: 800px;height: 100px;margin: 0 100px;}</style></head><body><div class=\"box\"><span class=\"dao\">2021年考研倒计时</span><div class=\"box1\"><span class=\"day\">1</span><span class=\"hour\">2</span><span class=\"minute\">3</span><span class=\"second\">4</span></div></div><script>var day = document.querySelector(\'.day\');var hour = document.querySelector(\'.hour\');var min = document.querySelector(\'.minute\');var sec = document.querySelector(\'.second\');var inputTime = +new Date(\'2020-12-19 8:30:00\'); //输入总毫秒数setInterval(countDown, 1000); //每隔一秒执行一次function countDown() {var nowTime = +new Date(); //当前总毫秒数var times = (inputTime - nowTime) / 1000; //倒计时总毫秒数var d = parseInt(times / 60 / 60 / 24);day.innerHTML = d + \'天\';var h = parseInt(times / 60 / 60 % 24);hour.innerHTML = h + \'时\';var m = parseInt(times / 60 % 60);min.innerHTML = m + \'分\';var s = parseInt(times % 60);sec.innerHTML = s + \'秒\';return d + \'天\' + h + \'时\' + m + \'分\' + s + \'秒\';}// console.log(countDown(\'2020-12-19 8:30:00\'));</script></body></html>
//成果展示：
