思路：先写一个结构和样式，然后写本月的时间，之后计算上下月份的关系
<!DOCTYPE html>
<html lang="en"> <head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
list-style: none;
} li.disabled {
background: #eee;
color: #ccc;
cursor: not-allowed;
} .container {
border: 1px solid #ccc;
margin: 50px;
width: 350px;
} .container li {
width: 50px;
height: 50px;
text-align: center;
line-height: 50px;
cursor: pointer;
} .container li:not(.disabled):hover {
background: rgb(185, 238, 238);
} .container ul {
display: flex;
flex-wrap: wrap;
} li.active {
background: darkcyan;
color: #fff;
}
button{
width: 50px; background-color: rgb(28, 113, 224);
color: #fff;
}
</style>
</head> <body>
<button class="prev">上月</button>
<button class="next">下月</button>
<div class="container">
<ul>
<li>日</li>
<li>一</li>
<li>二</li>
<li>三</li>
<li>四</li>
<li>五</li>
<li>六</li>
</ul>
<ul class='content'> </ul>
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js"></script>
<script>
$(function () { let totalDays = 0
let now = new Date()
let today = now.getDate()
let global_month = now.getMonth() + 1
let global_year = now.getFullYear() $('.prev').click(function () {
now.setMonth(now.getMonth() - 1) //6-31 7-1
initCalendar()
}) $('.next').click(function () {
now.setMonth(now.getMonth() + 1) //6-31 7-1
initCalendar()
}) function initCalendar() {
$('.content').empty()
let month = now.getMonth() + 1
let year = now.getFullYear() switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
totalDays = 31
break;
case 4:
case 6:
case 9:
case 11:
totalDays = 30
break
default:
if ((year % 4 === 0 && year % 100 !== 0) || year % 400 === 0) {
totalDays = 29
} else {
totalDays = 28
}
break;
} for (let i = 1; i <= totalDays; i++) {
let li = $('<li/>').text(i)
if (i === today && year === global_year && month === global_month) li.addClass('active')
$('.content').append(li)
} now.setDate(1)
let firstDay = now.getDay()
for (let i = 0; i < firstDay; i++) {
now.setDate(now.getDate() - 1)
let li = $('<li/>').text(now.getDate()).addClass('disabled')
$('.content').prepend(li)
}
now.setDate(now.getDate() + firstDay) now.setDate(totalDays) let lastDay = 6 - now.getDay()
for (let i = 0; i < lastDay; i++) {
now.setDate(now.getDate() + 1)
let li = $('<li/>').text(now.getDate()).addClass('disabled')
$('.content').append(li)
} now.setDate(now.getDate() - lastDay)
now.setDate(1)
} initCalendar()
})
</script>
</body> </html>