本篇文章主要是對js日期、星座的級聯顯示代碼進行了介紹，需要的朋友可以過來參考下，希望對大家有所幫助
js 代碼 代碼如下: function birthdayOnchange(obj) { var year = $("<%= DDL_Year.ClientID%>").value; if (year == "year") return; else year = parseInt(year, 10); var month = $("<%=DDL_Month.ClientID%>").value; if (month == "month") return; else month = parseInt(month, 10); var day = $("<%=DDL_Day.ClientID%>").value; var wholeday = getDays(year, month); if (1) { var options = $("<%=DDL_Day.ClientID%>").options; for (var i = 1; i <= wholeday; i++) { var j = i.toString(); j = j.length == 1 ? "0" + j : j; options.length = i + 1; options[i].value = j; options[i].text = j; if (day <= wholeday && i == day) { options[i].selected = true; } } } } function getDays(year, month) { var dayarr = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); if (month == 2) { if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0 || year < 1900) return 29; else return dayarr[month - 1]; } else { return dayarr[month - 1]; } } function adjustAstro() { var v_astro = getAstro($("<%=DDL_Month.ClientID%>").value, $("<%=DDL_Day.ClientID%>").value); $("<%=astro.ClientID %>").options[0].text = v_astro; } function getAstro(v_month, v_day) { v_month = parseInt(v_month, 10) v_day = parseInt(v_day, 10); if ((v_month == 12 && v_day >= 22) || (v_month == 1 && v_day <= 20)) { return "魔羯座"; } else if ((v_month == 1 && v_day >= 21) || (v_month == 2 && v_day <= 19)) { return "水瓶座"; } else if ((v_month == 2 && v_day >= 20) || (v_month == 3 && v_day <= 20)) { return "雙魚座"; } else if ((v_month == 3 && v_day >= 21) || (v_month == 4 && v_day <= 20)) { return "白羊座"; } else if ((v_month == 4 && v_day >= 21) || (v_month == 5 && v_day <= 21)) { return "金牛座"; } else if ((v_month == 5 && v_day >= 22) || (v_month == 6 && v_day <= 21)) { return "雙子座"; } else if ((v_month == 6 && v_day >= 22) || (v_month == 7 && v_day <= 22)) { return "巨蟹座"; } else if ((v_month == 7 && v_day >= 23) || (v_month == 8 && v_day <= 23)) { return "獅子座"; } else if ((v_month == 8 && v_day >= 24) || (v_month == 9 && v_day <= 23)) { return "處女座"; } else if ((v_month == 9 && v_day >= 24) || (v_month == 10 && v_day <= 23)) { return "天秤座"; } else if ((v_month == 10 && v_day >= 24) || (v_month == 11 && v_day <= 22)) { return "天蠍座"; } else if ((v_month == 11 && v_day >= 23) || (v_month == 12 && v_day <= 21)) { return "射手座"; } return ""; } html 代碼如下: <DIV>出生日期：</DIV> <DIV> <asp:DropDownList ID="DDL_Year" runat="server" onchange="birthdayOnchange(this);"></asp:DropDownList> 年 <asp:DropDownList ID="DDL_Month" runat="server" onchange="birthdayOnchange(this);adjustAstro();"></asp:DropDownList> 月 <asp:DropDownList ID="DDL_Day" runat="server" onchange="adjustAstro();"></asp:DropDownList> 日 </DIV> <DIV>星座：</DIV> <DIV> <SELECT id=astro disabled name=astro runat="server"> <OPTION selected>處女座</OPTION> </SELECT> </DIV>