<!DOCTYPE html>
<html lang="zh">
<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>
    <script src="../0622/jquery-3.3.1.min.js" type="text/javascript" charset="utf-8"></script>
</head>
<body>
    <!--每选择一次年重置一下月和日-->
    <select class="year" onchange="month(),day()"></select>
    <!--每选择一次月重置一下日-->
    <select class="month" onchange="day()"></select>
    <select class="day"></select>
</body>
</html>
<script type="text/javascript">
    $(function(){
        year();
        month();
        day();
    })
    function year(){
        var year = new Date().getFullYear();
        var str = "";
        for (var i = year-10;i<year+10;i++) {
            str += "<option>"+i+"</option>";
        }
        $(".year").html(str);
    }
    function month(){
        var year = new Date().getMonth();
        var str = "";
        for (var i = 1;i<13;i++) {
            str += "<option>"+i+"</option>";
        }
        $(".month").html(str);
    }
    function day(){
//        选则日之前先获取年和月
        var year_val = $(".year").val();
        var month_val = $(".month").val();
        var day_val = 30;
//        闰年的判断:普通年(不能被100整除的年份)能被4整除的为闰年。(如2004年就是闰年,1999年不是闰年);世纪年(能被100整除的年份)能被400整除的是闰年。(如2000年是闰年,1900年不是闰年);
        if(month_val == 1 || month_val == 3 || month_val == 5 || month_val == 7 || month_val == 8 || month_val == 10 || month_val == 12){
            day_val = 31;
        }else if(month_val == 2){
            if((year_val%4 == 0 && year_val%100 != 0)||year_val%400 == 0){
                day_val = 29;
            }else{
                day_val = 28;
            }
        }
        var year = new Date().getDate();
        var str = "";
        for (var i = 1;i<=day_val;i++) {
            str += "<option>"+i+"</option>";
        }
        $(".day").html(str);
    }
</script>

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本文链接:https://www.cnblogs.com/zhangbaozhong/p/9221825.html