从自定义日期显示日历

<div id="calendar"></div>

#calendar {
  width: 300px;
  border: 1px solid #ccc;
  padding: 10px;
}

#calendar table {
  width: 100%;
}

#calendar th,
#calendar td {
  text-align: center;
  padding: 5px;
}

#calendar th {
  background-color: #f2f2f2;
}

#calendar td {
  cursor: pointer;
}

#calendar td:hover {
  background-color: #f2f2f2;
}

function generateCalendar(year, month) {
  var calendar = document.getElementById("calendar");
  calendar.innerHTML = ""; // 清空日历内容

  var date = new Date(year, month - 1, 1); // 创建指定年月的日期对象
  var firstDay = date.getDay(); // 获取该月第一天是星期几
  var lastDate = new Date(year, month, 0).getDate(); // 获取该月的最后一天日期

  var table = document.createElement("table");
  var thead = document.createElement("thead");
  var tbody = document.createElement("tbody");

  // 生成表头
  var tr = document.createElement("tr");
  var weekdays = ["日", "一", "二", "三", "四", "五", "六"];
  for (var i = 0; i < 7; i++) {
    var th = document.createElement("th");
    th.textContent = weekdays[i];
    tr.appendChild(th);
  }
  thead.appendChild(tr);

  // 生成日期表格
  var day = 1;
  for (var i = 0; i < 6; i++) {
    var tr = document.createElement("tr");
    for (var j = 0; j < 7; j++) {
      var td = document.createElement("td");
      if (i === 0 && j < firstDay) {
        // 填充上个月的日期
        var lastMonthDate = new Date(year, month - 2, 0).getDate();
        td.textContent = lastMonthDate - firstDay + j + 1;
        td.classList.add("inactive");
      } else if (day > lastDate) {
        // 填充下个月的日期
        td.textContent = day - lastDate;
        td.classList.add("inactive");
        day++;
      } else {
        // 填充当前月的日期
        td.textContent = day;
        day++;
      }
      tr.appendChild(td);
    }
    tbody.appendChild(tr);
  }

  table.appendChild(thead);
  table.appendChild(tbody);
  calendar.appendChild(table);
}

// 调用函数生成日历
generateCalendar(2022, 10);