JS 获取今天以及后几天的月日和星期_js循环出当月所有日期和对应星期

作者：从前慢现在也慢 | 2024-03-26 01:36:06

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js循环出当月所有日期和对应星期

在开发中遇到了如下图需求，要显示一个星期对应的月份和星期计。
在这里插入图片描述
已封装了获取月份的方法getDateStr()和获取星期的方法getWeekDateStr()

<!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>
</head>

<body>
    <div id="listID"></div>
</body>
<script>
    //默认日期
    var listData = [{
        day: "8/19",
        time: "周一",
    }, {
        day: "8/20",
        time: "周二",
    }, {
        day: "8/21",
        time: "周三",
    }, {
        day: "8/22",
        time: "周四",
    }, {
        day: "8/23",
        time: "周五",
    }, {
        day: "8/24",
        time: "周六",
    }, {
        day: "8/25",
        time: "周日",
    },];
    // 更新数组月份日期
    function getDateStr(dayCount) {
        if (null == dayCount) {
            dayCount = 0;
        }
        var dd = new Date();
        dd.setDate(dd.getDate() + dayCount); //设置日期
        var m = dd.getMonth() + 1; //获取当前月份的日期
        var d = dd.getDate();
        if (d < 10) {
            return m + "/0" + d;
        } else {
            return m + "/" + d;
        }

    }
    for (let i = 0; i < 7; i++) {
        if (i == 0) {
            listData[i].day = '今天';
        } else if (i == 1) {
            listData[i].day = '明天';
        } else if (i == 2) {
            listData[i].day = '后天';
        } else {
            listData[i].day = getDateStr(i);
        }
    }
    //更新数组星期
    function getWeekDateStr(dayCount) {
        if (null == dayCount) {
            dayCount = 0;
        }
        //更新数组星期
        var weekStr = "周" + "日一二三四五六日一二三四五六".charAt(new Date().getDay() + dayCount);
        return weekStr;
    }
    for (let i = 0; i < 7; i++) {
        listData[i].time = getWeekDateStr(i);
    }
    //循环遍历到div中
    var listStr = "";
    for (var timeStr in listData) {
        if (timeStr == 0) {
            listStr += '<ul class="click-list-style">' + '<li>' + listData[timeStr].day + '</li><li class="order-mid-left-text" >' + listData[timeStr].time + '</li>' + '</ul>';
        } else {
            listStr += '<ul>' + '<li>' + listData[timeStr].day + '</li><li class="order-mid-left-text" >' + listData[timeStr].time + '</li>' + '</ul>';
        }

    }
    document.getElementById("listID").innerHTML = listStr;
</script>

</html>
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