日历小案例

成品

一 二 三 四 五 六 日

代码

HTML

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<div id="calendar">
    <div id="yue">
        <span></span>
    </div>
    <div id="rl">
        <div>
            <span>一</span>
            <span>二</span>
            <span>三</span>
            <span>四</span>
            <span>五</span>
            <span>六</span>
            <span>日</span>
        </div>
        <div>
            <div>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
            </div>
            <div>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
            </div>
            <div>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
            </div>
            <div>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
            </div>
            <div>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
            </div>
            <div>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                <span></span>
            </div>
        </div>
    </div>
</div>

CSS

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* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
#calendar {
    width: 300px;
    background-color: rgb(255, 251, 240);
    border-radius: 10px;
    margin: auto;
}
#yue {
    border-radius: 10px 10px 0 0;
    width: 100%;
    height: 140px;
    margin-bottom: 10px;
    background-image: url(https://img.zcool.cn/community/0112bb5d77c95ea801211d53761186.gif);
    background-size: cover;
    position: relative;
}
#yue>span {
    font-size: 50px;
    color: rgb(95, 255, 250);
    position: absolute;
    bottom: 20px;
    right: 20px;
}
#rl {
    width: 100%;
    padding: 5px 10px 10px 10px;
}
#rl span {
    display: inline-block;
    width: 35px;
    text-align: center;
    line-height: 25px;
    height: 25px;
}
#rl>div>span {
    color: rgb(207, 165, 255);
    border-bottom: 2px solid pink;
    margin-bottom: 10px;
}
#rl>div>div span {
    font-weight: 600;
}

JS

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var date = new Date();
// 月份
var yues = document.querySelector('#yue>span');
yues.innerHTML = date.getMonth() + 1;
// 获取月份天数
function getDays(year, month) {
    let days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
    if ((year % 4 === 0) && (year % 100 !== 0 || year % 400 === 0)) {
        days[1] = 29;
    }
    return days[month]
}
// 详细日期
var yue = date.getMonth();
var qi = getDays(date.getFullYear(), yue);
// 求出每月第一天是周几
var xingqi = date.getDay();
xingqi = xingqi === 0 ? 7 : xingqi;
for (let i = 0; i < parseInt(date.getDate() % 7) - 1; i++) {
    xingqi--;
    if (xingqi === 0) xingqi = 7;
}
// 输出日历
xingqi--;
var td = document.querySelectorAll('#rl>div>div span');
for (let i = 0; i < xingqi; i++) {
    td[i].innerText = '😈';
}
for (let i = xingqi; i <= qi + xingqi; i++) {
    td[i].innerText = i - xingqi + 1;
    if (i === xingqi + date.getDate() - 1) td[i].style.borderBottom = "2px solid pink";
}
for (let i = xingqi + qi; i < td.length; i++) {
    td[i].innerText = '👿';
}