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話(huà)不多說(shuō)直接上代碼、
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title></head><body> <p> <span class="hour">1</span> <span class="minute">2</span> <span class="second">3</span> </p> <script> var hour = document.querySelector('.hour'); //小時(shí)的黑色盒子 var minute = document.querySelector('.minute'); //分鐘的黑色盒子 var second = document.querySelector('.second'); //秒數(shù)的盒子 var inputTime = +new Date('2021-4-10 23:00:00'); //返回的是用戶(hù)輸入的時(shí)間總的毫秒數(shù) // 封裝好的計(jì)算時(shí)間的函數(shù) //先調(diào)用一次函數(shù)防止開(kāi)始出現(xiàn)空白 countDown(); //開(kāi)啟定時(shí)器 setInterval(countDown,1000); function countDown() { var nowTime = +new Date(); //返回的是當(dāng)前時(shí)間的走毫秒數(shù) var times = (inputTime - nowTime) / 1000; //times是剩余時(shí)間的總數(shù) // var d = parseInt(times / 60 / 60 / 24); //天 // d = d < 10 ? '0' + d : d; var h = parseInt(times / 60 / 60 % 24); //時(shí) h = h < 10 ? '0' + h : h; hour.innerHTML = h; //把剩余的小時(shí)給小時(shí)黑盒子 var m = parseInt(times / 60 % 60); //當(dāng)前秒 m = m < 10 ? '0' + m : m; minute.innerHTML = m;//把剩余的分鐘給盒子 var s =parseInt(times%60);//當(dāng)前秒 s = s < 10 ? '0' + s : s; second.innerHTML = s;//把剩余的秒數(shù)給盒子 // return d + '天' + h + '時(shí)' + m + '分' + s + '秒'; } </script></body></html>
這里封裝了一個(gè)時(shí)間轉(zhuǎn)換的函數(shù)：
function countDown() { var nowTime = +new Date(); //返回的是當(dāng)前時(shí)間的走毫秒數(shù) var times = (inputTime - nowTime) / 1000; //times是剩余時(shí)間的總數(shù) var d = parseInt(times / 60 / 60 / 24); //天 d = d < 10 ? '0' + d : d; var h = parseInt(times / 60 / 60 % 24); //時(shí) h = h < 10 ? '0' + h : h; var m = parseInt(times / 60 % 60); //當(dāng)前秒 m = m < 10 ? '0' + m : m; var s =parseInt(times%60);//當(dāng)前秒 s = s < 10 ? '0' + s : s; return d + '天' + h + '時(shí)' + m + '分' + s + '秒'; }
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