<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <script src="js/jquery-1.7.2.min.js"></script> <title></title> </head> <body> <form id="form1" runat="server"> <div> <asp:DropDownList ID="dr_year" runat="server"></asp:DropDownList>年 <asp:DropDownList ID="dr_month" runat="server"></asp:DropDownList>月 <asp:DropDownList ID="dr_day" runat="server"></asp:DropDownList>日 </div> </form> </body> </html> <script> var days = 0; years(); months(); Days(); var date = new Date(); $("#dr_year").val(date.getFullYear()); $("#dr_month").val((date.getMonth() + 1)); $("#dr_day").val(date.getDate()); $("#dr_year").change(function () { months(); Days(); }); $("#dr_month").change(function () { Days(); }); function years() { for(var i=1900;i<=2100;i++) { var str = "<option value="" + i + "">" + i+ "</option>"; $("#dr_year").append(str); } } function months() { $("#dr_month").empty(); for (var i = 1; i <= 12; i++) { var str = "<option value="" + i + "">" + i + "</option>"; $("#dr_month").append(str); } } function Days() { $("#dr_day").empty(); if (parseInt($("#dr_month").val()) == 1 || parseInt($("#dr_month").val()) == 3 || parseInt($("#dr_month").val()) == 5 || parseInt($("#dr_month").val()) == 7 || parseInt($("#dr_month").val()) == 8 || parseInt($("#dr_month").val()) == 10 || parseInt($("#dr_month").val()) == 12) { days = 31; } else if (parseInt($("#dr_month").val()) == 4 || parseInt($("#dr_month").val()) == 6 || parseInt($("#dr_month").val()) == 9 || parseInt($("#dr_month").val()) == 11) { days = 30; } else { if (parseInt($("#dr_year").val()) % 400 == 0 || (parseInt($("#dr_year").val()) % 4 == 0 && parseInt($("#dr_year").val()) % 100 != 0)) { days = 29; } else { days = 28; } } for (var i = 1; i <= days; i++) { var str = "<option value="" + i + "">" + i + "</option>"; $("#dr_day").append(str); } } </script>