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经典回顾倒计时
倒计时的基本布局介绍。
一个内容区域和一个输入区域，内容区域进行划分
直接使用flex布局会更快一点。
js代码
我们利用一下模块化思想，直接把获得时间这个功能写成一个函数。方便后续的调用
function getTime() {const date = new Date()return `今年是${date.getFullYear()}年${date.getMonth()+1}月${date.getDate()}日`}document.querySelector('.contain-top').innerHTML = getTime()
然后将输入框中的事件给加载进去，注意格式的划分。使用基本的时间算法
const input = document.querySelector('input')function dateChat() {const nowdate = +new Date()let enddate = +new Date()let time = 0const date1 = new Date()enddate = +new Date(`${date1.getFullYear()}-${date1.getMonth()+1}-${date1.getDate()} ${input.value}`)time = (enddate - nowdate) / 1000let h = parseInt(time / 60 / 60 % 24)h = h < 10 ? '0 ' + h : h + " "let m = parseInt(time / 60 % 60)m = m < 10 ? '0 ' + m : m + " "let s = parseInt(time % 60)s = s < 10 ? '0' + s : sdocument.querySelector('.hour').innerHTML = hdocument.querySelector('.min').innerHTML = mdocument.querySelector('.second').innerHTML = s}
设置回车监听和按钮监听
input.addEventListener('keyup', function (e) {if (e.key === 'Enter') {if (input.value.length > 8) {alert('输入有误')} else {document.querySelector('.timeout').innerHTML = input.valuedateChat()setInterval(dateChat, 1000)}}})const button = document.querySelector('button')button.addEventListener('click', function () {if (input.value.length > 8) {alert('输入有误')} else {document.querySelector('.timeout').innerHTML = input.valuedateChat()setInterval(dateChat, 1000)}})
完整代码
<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>倒计时</title><style>* {padding: 0;margin: 0;box-sizing: border-box;}.contain {width: 300px;height: 300px;background-color: rgb(174, 10, 42);margin: 0 auto;}.contain-top {text-align: center;color: white;padding-top: 20px;margin-bottom: 20px;}.font {text-align: center;color: white;font-size: 25px;}.contain-middle-time {display: flex;justify-content: center;}.contain-middle-time div {text-align: center;margin-top: 40px;width: 40px;line-height: 40px;height: 40px;color: white;background-color: rgb(50, 44, 44);border-radius: 5px;}.contain-middle-time .word {width: 20px;height: 20px;color: white;background-color: rgb(174, 10, 42);}.timeout {margin-top: 60px;font-size: 20px;color: white;text-align: center;}.timeout::after {content: "下课";}.timechoice {margin-top: 10px;text-align: center;}input {outline: none;text-align: center;width: 100px;height: 20px;border: 1px solid black;border-radius: 3px;}button {background-color: white;height: 20px;border: none;color: black;border-radius: 2px;}button:active {color: red;}</style>
</head><body><div class="contain"><div class="contain-top">今年是2222年2月22日</div><div class="font">下班倒计时</div><div class="contain-middle-time"><div class="hour">12</div><div class="word">:</div><div class="min">12</div><div class="word">:</div><div class="second">12</div></div><div class="timeout">18 : 30 : 00</div></div><div class="timechoice"><input type="text" placeholder="18:00:00"><button>提交</button></div><script>//加载上边的时间function getTime() {const date = new Date()return `今年是${date.getFullYear()}年${date.getMonth()+1}月${date.getDate()}日`}document.querySelector('.contain-top').innerHTML = getTime()// 加载定义的下课时间const input = document.querySelector('input')function dateChat() {const nowdate = +new Date()let enddate = +new Date()let time = 0const date1 = new Date()enddate = +new Date(`${date1.getFullYear()}-${date1.getMonth()+1}-${date1.getDate()} ${input.value}`)time = (enddate - nowdate) / 1000let h = parseInt(time / 60 / 60 % 24)h = h < 10 ? '0 ' + h : h + " "let m = parseInt(time / 60 % 60)m = m < 10 ? '0 ' + m : m + " "let s = parseInt(time % 60)s = s < 10 ? '0' + s : sdocument.querySelector('.hour').innerHTML = hdocument.querySelector('.min').innerHTML = mdocument.querySelector('.second').innerHTML = s}input.addEventListener('keyup', function (e) {if (e.key === 'Enter') {if (input.value.length > 8) {alert('输入有误')} else {document.querySelector('.timeout').innerHTML = input.valuedateChat()setInterval(dateChat, 1000)}}})const button = document.querySelector('button')button.addEventListener('click', function () {if (input.value.length > 8) {alert('输入有误')} else {document.querySelector('.timeout').innerHTML = input.valuedateChat()setInterval(dateChat, 1000)}})// 倒计时模块</script>
</body></html>