只有年月日的日历（前端代码实现）

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml">    <head>        <meta charset="UTF-8"/>        <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />        <title>JS年月日三级联动下拉框日期选择代码</title>    </head>    <body>        <form name="reg_testdate">            <select name="YYYY" onChange="YYYYDD(this.value)">                <option value="">请选择 年</option>            </select>            <select name="MM" onChange="MMDD(this.value)">                <option value="">选择 月</option>            </select>            <select name="DD">                <option value="">选择 日</option>            </select>        </form>        <script language="JavaScript">            function YYYYMMDDstart() {                MonHead = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];                //先给年下拉框赋内容                   var y = new Date().getFullYear();                for (var i = (y - 30); i < (y + 30); i++) //以今年为准，前30年，后30年                       document.reg_testdate.YYYY.options.add(new Option(" " + i + " 年", i));                //赋月份的下拉框                   for (var i = 1; i < 13; i++)                    document.reg_testdate.MM.options.add(new Option(" " + i + " 月", i));                document.reg_testdate.YYYY.value = y;                document.reg_testdate.MM.value = new Date().getMonth() + 1;                var n = MonHead[new Date().getMonth()];                if (new Date().getMonth() == 1 && IsPinYear(YYYYvalue)) n++;                writeDay(n); //赋日期下拉框Author:meizz                   document.reg_testdate.DD.value = new Date().getDate();            }            if (document.attachEvent)                window.attachEvent("onload", YYYYMMDDstart);            else                window.addEventListener('load', YYYYMMDDstart, false);            function YYYYDD(str) //年发生变化时日期发生变化(主要是判断闰平年)               {                var MMvalue = document.reg_testdate.MM.options[document.reg_testdate.MM.selectedIndex].value;                if (MMvalue == "") {                    var e = document.reg_testdate.DD;                    optionsClear(e);                    return;                }                var n = MonHead[MMvalue - 1];                if (MMvalue == 2 && IsPinYear(str)) n++;                writeDay(n)            }            function MMDD(str) //月发生变化时日期联动               {                var YYYYvalue = document.reg_testdate.YYYY.options[document.reg_testdate.YYYY.selectedIndex].value;                if (YYYYvalue == "") {                    var e = document.reg_testdate.DD;                    optionsClear(e);                    return;                }                var n = MonHead[str - 1];                if (str == 2 && IsPinYear(YYYYvalue)) n++;                writeDay(n)            }            function writeDay(n) //据条件写日期的下拉框               {                var e = document.reg_testdate.DD;                optionsClear(e);                for (var i = 1; i < (n + 1); i++)                    e.options.add(new Option(" " + i + " 日", i));            }            function IsPinYear(year) //判断是否闰平年               {                return (0 == year % 4 && (year % 100 != 0 || year % 400 == 0));            }            function optionsClear(e) {                e.options.length = 1;            }        </script>    </body></html>
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