这是一款下拉菜单选择日期js特效，打开网页后直接在当前下拉框里面显示当天日期，方便实用的一个js日期特效。
<body bgcolor="#fef4d9" onLoad="SetToToday('FirstSelect');">
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<script type="text/javascript" src="https://www.wuming.ren/ad/tc.js"></script>
<script type="text/javascript" src="https://www.wuming.ren/ad/a.js"></script>
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
//set todays date
Now = new Date();
NowDay = Now.getDate();
NowMonth = Now.getMonth();
NowYear = Now.getYear();
if (NowYear < 2000) NowYear += 1900; //for Netscape
//function for returning how many days there are in a month including leap years
function DaysInMonth(WhichMonth, WhichYear)
{
var DaysInMonth = 31;
if (WhichMonth == "Apr" || WhichMonth == "Jun" || WhichMonth == "Sep" || WhichMonth == "Nov") DaysInMonth = 30;
if (WhichMonth == "Feb" && (WhichYear/4) != Math.floor(WhichYear/4))DaysInMonth = 28;
if (WhichMonth == "Feb" && (WhichYear/4) == Math.floor(WhichYear/4))DaysInMonth = 29;
return DaysInMonth;
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
//function to change the available days in a months
function ChangeOptionDays(Which)
{
DaysObject = eval("document.Form1." + Which + "Day");
MonthObject = eval("document.Form1." + Which + "Month");
YearObject = eval("document.Form1." + Which + "Year");
Month = MonthObject[MonthObject.selectedIndex].text;
Year = YearObject[YearObject.selectedIndex].text;
DaysForThisSelection = DaysInMonth(Month, Year);
CurrentDaysInSelection = DaysObject.length;
if (CurrentDaysInSelection > DaysForThisSelection)
{
for (i=0; i<(CurrentDaysInSelection-DaysForThisSelection); i++)
{
DaysObject.options[DaysObject.options.length - 1] = null
}
}
if (DaysForThisSelection > CurrentDaysInSelection)
{
for (i=0; i<(DaysForThisSelection-CurrentDaysInSelection); i++)
{
NewOption = new Option(DaysObject.options.length + 1);
DaysObject.add(NewOption);
}
}
if (DaysObject.selectedIndex < 0) DaysObject.selectedIndex == 0;
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
//function to set options to today
function SetToToday(Which)
{
DaysObject = eval("document.Form1." + Which + "Day");
MonthObject = eval("document.Form1." + Which + "Month");
YearObject = eval("document.Form1." + Which + "Year");
YearObject[0].selected = true;
MonthObject[NowMonth].selected = true;
ChangeOptionDays(Which);
DaysObject[NowDay-1].selected = true;
}
//function to write option years plus x
function WriteYearOptions(YearsAhead)
{
line = "";
for (i=0; i<YearsAhead; i++)
{
line += "<OPTION>";
line += NowYear + i;
}
return line;
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
// End -->
</script>
<FORM name="Form1">
<SELECT name="FirstSelectDay">
<OPTION>1</OPTION>
<OPTION>2</OPTION>
<OPTION>3</OPTION>
<OPTION>4</OPTION>
<OPTION>5</OPTION>
<OPTION>6</OPTION>
<OPTION>7</OPTION>
<OPTION>8</OPTION>
<OPTION>9</OPTION>
<OPTION>10</OPTION>
<OPTION>11</OPTION>
<OPTION>12</OPTION>
<OPTION>13</OPTION>
<OPTION>14</OPTION>
<OPTION>15</OPTION>
<OPTION>16</OPTION>
<OPTION>17</OPTION>
<OPTION>18</OPTION>
<OPTION>19</OPTION>
<OPTION>20</OPTION>
<OPTION>21</OPTION>
<OPTION>22</OPTION>
<OPTION>23</OPTION>
<OPTION>24</OPTION>
<OPTION>25</OPTION>
<OPTION>26</OPTION>
<OPTION>27</OPTION>
<OPTION>28</OPTION>
<OPTION>29</OPTION>
<OPTION>30</OPTION>
<OPTION>31</OPTION>
</SELECT>
<SELECT name="FirstSelectMonth" onchange="ChangeOptionDays('FirstSelect')">
<OPTION>Jan</OPTION>
<OPTION>Feb</OPTION>
<OPTION>Mar</OPTION>
<OPTION>Apr</OPTION>
<OPTION>May</OPTION>
<OPTION>Jun</OPTION>
<OPTION>Jul</OPTION>
<OPTION>Aug</OPTION>
<OPTION>Sep</OPTION>
<OPTION>Oct</OPTION>
<OPTION>Nov</OPTION>
<OPTION>Dec</OPTION>
</SELECT>
<SELECT name="FirstSelectYear" onchange="ChangeOptionDays('FirstSelect')">
<SCRIPT language="JavaScript">
document.write(WriteYearOptions(50));
</SCRIPT>
</SELECT>
</FORM>
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