日期校验

Question

http://www.sayee.com/cloudchen/js/date.htm

Answer 1

Date.prototype.getLastDay = function(year,month) {
    if(arguments.length==2)
return(new Date(year,month,0).getDate())
else
with(new Date())return(new Date(getYear(),getMonth()+1,0).getDate())
}
//系统变量
var i,j=0,iYearSelectedIndex,iDateSelectIndex;
var now = new Date();
with(now) var nowY=getYear(),nowM=getMonth()+1,nowD=getDate(),nowLD=getLastDay();
//用户变量
var startYear = 1949,endYear = 2049;
var formYname="year",formMname="month",formDname="date";
var sYearTip="年",sMonthTip="月",sDateTip="日";
//创建到哪里
var oWhere = document.forms[0];
//创建所有的对象
var elemYear = new Array(),elemMonth = new Array(),elemDate = new Array();
with(document) {
elemYear[0] = createElement("<SELECT name='"+formYname+"'>");
elemYear[1] = createTextNode(sYearTip);
elemMonth[0] = createElement("<SELECT name='"+formMname+"'>");
elemMonth[1] = createTextNode(sMonthTip);
elemDate[0] = createElement("<SELECT name='"+formDname+"'>");
elemDate[1] = createTextNode(sDateTip);
}
//设置所有对象的属性
//className,id
with(elemYear[0])className="userData",id="Year";
with(elemMonth[0])className="userData",id="Month";
with(elemDate[0])className="userData",id="Date";
//按索引顺序逐个添加对象
appendAllChild(elemYear),appendAllChild(elemMonth),appendAllChild(elemDate);
//创建列表框内容
CreateYearOptions()
CreateMonthOptions();
CreateDateOptions(nowLD,nowD-1);
//触发onchange事件
elemYear[0].onchange = function() {CreateDateOptions(now.getLastDay(this.value,elemMonth[0].value))}
elemMonth[0].onchange = function() {CreateDateOptions(now.getLastDay(elemYear[0].value,this.value))}
elemDate[0].onchange = function() {iDateSelectIndex=this.selectedIndex}
/* FUNCTION */
//append Child function
function appendAllChild(elem) {
with(oWhere) {
for (var i=0;i<elem.length;i++)
appendChild(elem[i]);
}
}
//create options of year
function CreateYearOptions() {
with(elemYear[0]) {
for (i=startYear;i<=endYear;i++) {
options[j] = new Option(i,i);
j++;
}
iYearSelectedIndex = nowY-startYear
options[iYearSelectedIndex].selected=true;
}
}
//create options of month
function CreateMonthOptions() {
with(elemMonth[0]) {
for (i=0;i<12;i++)options[i] = new Option(i+1,i+1);
options[nowM-1].selected=true;
}
}
//create options of date
function CreateDateOptions(lastday,selectToday) {
with(elemDate[0]) {
length=0;
for (i=0;i<lastday;i++)options[i] = new Option(i+1,i+1)
if (selectToday) {
options[selectToday].selected=true,iDateSelectIndex=selectToday;
} else {
iDateSelectIndex = Math.min(iDateSelectIndex,lastday-1);
}
options[iDateSelectIndex].selected=true;
}
}
/*记录用户选择状态，以下内容可以删除！*/
document.body.onload = function() {LoadUserData()};
document.body.onunload = function() {SaveUserData();}//关闭窗口时Save
document.body.onbeforeunload = function() {SaveUserData();}//跳到其他URL时Save
document.all.permit.onclick = function () {
with(document.all.permit) {
setAttribute("auto",checked);
save("userAutoSaveLoad");
}
}function SaveUserData() {
if(LoadAuto()||arguments.length) {
saveFunction(document.all.Year);
saveFunction(document.all.Month);
saveFunction(document.all.Date);
}
}
function LoadUserData() {
if(LoadAuto()||arguments.length) {
LoadFunction(document.all.Year);
LoadFunction(document.all.Month);
LoadFunction(document.all.Date);
iDateSelectIndex = document.all.Date.selectedIndex;
}
}
function ClearUserData() {
with(document.all) {
ClearFunction(Year,iYearSelectedIndex)
ClearFunction(Month,nowM-1)
ClearFunction(Date,nowD-1)
}
}
function saveFunction(elem) {
with(elem) {
setAttribute("userSelect",selectedIndex);
save("userSelectedIndex"+id);
}
}
function LoadFunction(elem) {
with(elem) {
load("userSelectedIndex"+id);
iIndex = getAttribute("userSelect");
if(iIndex!=null)selectedIndex=iIndex;
}
}
function ClearFunction(elem,iIndex) {
with(elem) {
removeAttribute("userSelect");
save("userSelectedIndex"+id);
options[iIndex].selected=true;
}
}
function LoadAuto() {
with(document.all.permit) {
load("userAutoSaveLoad");
if(getAttribute("auto")=="true")
checked=true;
else
checked=false;
return(checked)
}
}
/*Show Value*/
function showValue() {
alert(document.forms[0][formYname].value+"-"+document.forms[0][formMname].value+"-"+document.forms[0][formDname].value)
}