Js对Select控件进行联动操作，一个select选择月份后另一个select生成对应月份的所有日期。
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> <script type="text/javascript"> window.onload = initForm; function initForm() { document.getElementById("months").selectedIndex = 0; document.getElementById("months").onchange = populateDays; } function populateDays() { var monthDays = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); var monthStr = this.options[this.selectedIndex].value; if (monthStr != "") { var theMonth = parseInt(monthStr); document.getElementById("days").options.length = 0; for (var i = 0; i < monthDays[theMonth]; i++) { document.getElementById("days").options[i] = new Option(i + 1); } } } </script> </head> <body> <form id="form1" runat="server"> <div> <select runat="server" id="months"> <option value="">Month</option> <option value="0">January</option> <option value="1">February</option> <option value="2">March</option> <option value="3">April</option> <option value="4">May</option> <option value="5">June</option> <option value="6">July</option> <option value="7">August</option> <option value="8">September</option> <option value="9">October</option> <option value="10">November</option> <option value="11">December</option> </select> <select runat="server" id="days"> <option>Day</option> </select> </div> </form> </body> </html>