js日历,纯手工,多多指正

基本实现上一月下一月,时间关系,有些细节没有完善,纯手工,应该有其它更好的办法可以参考
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>js日历</title>
    <style>
        .wrap {
            width: 500px;
            padding: 10px;
        }
        .tool_box {
            height: 50px;
            display: flex;
            background: cornflowerblue;
            justify-content: space-between;;
            align-items: center;
        }
        .current {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .week {
            height: 50px;
            display: flex;
            justify-content: space-around;
            align-items: center;
            background: #CCCCCC;
        }
        .days {
            display: flex;
            flex-wrap: wrap;
            text-align: center;
        }
        .days div {
            width: 71px;
            height: 50px;
        }
        .current_day {
            color: #FF0000;
        }
    </style>
</head>
<body>
<div class="wrap">
    <div class="tool_box">
        <div class="prev">上一月</div>
        <div class="current">
            <div class="year" id="year">年</div>
            <div class="month" id="month">月</div>
        </div>
        <div class="next">下一月</div>
    </div>
    <div class="week">
        <div class="week_item">日</div>
        <div class="week_item">一</div>
        <div class="week_item">二</div>
        <div class="week_item">三</div>
        <div class="week_item">四</div>
        <div class="week_item">五</div>
        <div class="week_item">六</div>
    </div>
    <div class="days" id="days">
    </div>
</div>
<script>
    var monthArr = [
        '一月',
        '二月',
        '三月',
        '四月',
        '五月',
        '六月',
        '七月',
        '八月',
        '九月',
        '十月',
        '十一月',
        '十二月'
    ]
    function getDays(today) {
        var month = today.getMonth();
        var yearStr = today.getFullYear(); //当前年
        document.querySelector('#year').textContent = yearStr;
        var monthStr = monthArr[month]; //当前月
        document.querySelector('#month').textContent = monthStr;
        var date = today.getDate(); //当前日
        var currentMonth = today.setDate(1);
        var monthFirstDay = new Date(currentMonth); //本月1日
        var currentMonthFirstWeek = monthFirstDay.getDay();
        nextMonth = monthFirstDay.setMonth(month + 1);
        prevMonth = monthFirstDay.setMonth(month - 1)
        var currentMonthLastDay = new Date(nextMonth - 86400000)
        var currentMonthLastDayStr = currentMonthLastDay.getDate();
        var day = '';
        for (let w = 0; w < currentMonthFirstWeek; w++) {
            day += '<div></div>';
        }
        for (let i = 1; i <= currentMonthLastDayStr; i++) {
            if (i == date) {
                day += '<div class="current_day">' + i + '</div>';
            } else {
                day += '<div>' + i + '</div>';
            }
        }
        document.querySelector('#days').innerHTML = day;
    }
    var today = new Date();
    getDays(today);
    document.querySelector('.next').onclick = function () {
        today = new Date(nextMonth);
        getDays(today)
    }
    document.querySelector('.prev').onclick = function () {
        today = new Date(prevMonth);
        getDays(today);
    }
</script>
</body>
</html>
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