根据当前年的前五年后五年的年月日
??????<select id="nian" onclick="Bian()"></select>年 ???????<select id="yue" onclick="Bian()"></select>月 ???????<select id="ri"></select>日
布局大的框架和效果然后写入年的函数并且调用年的函数
????????????????FillYear() ???????????????function FillYear(){var b = new Date();var nian = parseInt(b.getFullYear());var str;for(var i=nian-5;i<nian+6;i++){str = str+"<option>"+i+"</option>";}document.getElementById("nian").innerHTML = str;}写入月的函数并且调用月的函数
???????????????FillYue() ??????????????????????????function FillYue(){var b = new Date();var y = parseInt(b.getMonth()+1);var str;for(var i=1;i<13;i++){str = str+"<option>"+i+"</option>";}document.getElementById("yue").innerHTML = str;
写入日的函数并且调用日的函数
闰年是可以被四整除不能被100整除，并且可以被400整除，1 3 5 7 8 10 12每个月31年闰年2月28天
???????????????FillTian()
???????????????function FillTian(){var b = new Date();var r = parseInt(b.getDate());var nian = document.getElementById("nian").value;var yue = document.getElementById("yue").value;ts=31;if(yue==4 || yue==6 || yue==9 || yue==11){ts=30;}if(yue==2){if((nian%4==0 && nian%100!=0) || nian%400==0){ts=29;}else{ts=28;}}var str;for(var i=1;i<ts+1;i++){str = str+"<option>"+i+"</option>";}document.getElementById("ri").innerHTML = str;}
默认选中为当前的年月日
???????FillYear();FillYue();FillTian(); ???????????function FillYear(){var b = new Date();var nian = parseInt(b.getFullYear());var str;for(var i=nian-5;i<nian+6;i++){if(i==nian){str = str+"<option selected=‘selected‘>"+i+"</option>";}else{str = str+"<option>"+i+"</option>";}}document.getElementById("nian").innerHTML = str;}function FillYue(){var b = new Date();var y = parseInt(b.getMonth()+1);var str;for(var i=1;i<13;i++){if(i==y){str = str+"<option selected=‘selected‘>"+i+"</option>";}else{str = str+"<option>"+i+"</option>";}}document.getElementById("yue").innerHTML = str;}function FillTian(){var b = new Date();var r = parseInt(b.getDate());var nian = document.getElementById("nian").value;var yue = document.getElementById("yue").value;ts=31;if(yue==4 || yue==6 || yue==9 || yue==11){ts=30;}if(yue==2){if((nian%4==0 && nian%100!=0) || nian%400==0){ts=29;}else{ts=28;}}var str;for(var i=1;i<ts+1;i++){if(i==r){str = str+"<option selected=‘selected‘>"+i+"</option>";}else{str = str+"<option>"+i+"</option>";}}document.getElementById("ri").innerHTML = str;}最后用年月日的函数使日跟着年月变
最后加一组函数
???????????????function Bian(){FillTian();}JS实例4
原文地址：http://www.cnblogs.com/navyouth/p/7729429.html