HTML简单电子日历

以下是一个简单的HTML电子日历示例，它可以显示当前日期以及前一个月和后一个月的日期，并且可以通过点击日期来选择日期。



<!DOCTYPE html>
<html>
<head>
<style>
  * {
    box-sizing: border-box;
  }
  body {
    font-family: Arial, sans-serif;
  }
  .calendar {
    max-width: 250px;
    margin: 50px auto;
    padding: 10px;
    background-color: #f2f2f2;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-shadow: 2px 2px 5px rgba(0,0,0,.3);
  }
  .calendar-header {
    text-align: center;
    padding: 10px 0;
    background-color: #4CAF50;
    color: white;
  }
  .calendar-header h1 {
    font-size: 18px;
  }
  .calendar-header h2 {
    font-size: 12px;
  }
  .calendar-days {
    padding: 10px 0;
    background-color: #f2f2f2;
    display: flex;
    align-items: center;
  }
  .calendar-days span {
    display: inline-block;
    width: 30px;
    height: 30px;
    text-align: center;
    line-height: 30px;
    margin: 0 5px;
  }
  .calendar-days span:hover {
    background-color: #ddd;
    cursor: pointer;
  }
  .calendar-month {
    text-align: center;
    padding: 10px 0;
  }
  .calendar-month h1 {
    font-size: 18px;
  }
  .calendar-days-of-week {
    display: flex;
    text-transform: uppercase;
  }
  .calendar-days-of-week span {
    flex: 1;
    text-align: center;
  }
  .day-number {
    display: block;
    width: 30px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    border-radius: 50%;
    margin: 0 auto;
  }
  .day-number:hover {
    background-color: #ddd;
    cursor: pointer;
  }
  .selected {
    background-color: #4CAF50;
    color: white;
  }
</style>
</head>
<body>
 
<div class="calendar">
  <div class="calendar-header">
    <h1 id="month-year"></h1>
    <h2 id="weekday"></h2>
  </div>
  <div class="calendar-month">
    <h1 id="month"></h1>
  </div>
  <div class="calendar-days-of-week">
    <span>Sun</span>
    <span>Mon</span>
    <span>Tue</span>
    <span>Wed</span>
    <span>Thu</span>
    <span>Fri</span>
    <span>Sat</span>
  </div>
  <div class="calendar-days" id="days"></div>
</div>
 
<script>
function renderCalendar() {
  const now = new Date();
  const daysInMonth = new Date(now.getFullYear(), now.getMonth() + 1, 0).getDate();
  const daysOfWeek = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
 
  let
HTML简单电子日历

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