用JS实现日期的选择（珍藏）

在页面建立JS代码：

<script language="JavaScript" type="text/JavaScript">
/*=======Calendar.js=======By Jiang Hongbin=======*/

var months = new Array("一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月");
var daysInMonth = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
var days = new Array("日","一", "二", "三", "四", "五", "六");
var today;

document.writeln("

");

function getDays(month, year)
{
    //下面的这段代码是判断当前是否是闰年的

    if (1 == month)
        return ((0 == year % 4) && (0 != (year % 100))) || (0 == year % 400) ? 29 : 28;
    else
        return daysInMonth[month];
}

function getToday()
{
    //得到今天的年,月,日

    this.now = new Date();
    this.year = this.now.getFullYear();
    this.month = this.now.getMonth();
    this.day = this.now.getDate();
}

function getStringDay(str)
{
    //得到输入框的年,月,日

    var str=str.split("-")
    
    this.now = new Date(parseFloat(str[0]),parseFloat(str[1])-1,parseFloat(str[2]));
    this.year = this.now.getFullYear();
    this.month = this.now.getMonth();
    this.day = this.now.getDate();
}

function newCalendar() {
    var parseYear = parseInt(document.all.Year.options[document.all.Year.selectedIndex].value);
    var newCal = new Date(parseYear, document.all.Month.selectedIndex, 1);
    var day = -1;
    var startDay = newCal.getDay();
    var daily = 0;
    
    if ((today.year == newCal.getFullYear()) &&(today.month == newCal.getMonth()))
        day = today.day;
        
    var tableCal = document.all.calendar;
    var intDaysInMonth =getDays(newCal.getMonth(), newCal.getFullYear());
    
    for (var intWeek = 1; intWeek < tableCal.rows.length;intWeek++)
        for (var intDay = 0;intDay < tableCal.rows[intWeek].cells.length;intDay++)
        {
            var cell = tableCal.rows[intWeek].cells[intDay];
            if ((intDay == startDay) && (0 == daily))
                daily = 1;
                
            if(day==daily) //今天，调用今天的Class

            {
                cell.style.background='#6699CC';
                cell.style.color='#FFFFFF';
                //cell.style.fontWeight='bold';

            }
            else if(intDay==6) //周六

                cell.style.color='green';
            else if (intDay==0) //周日

                cell.style.color='red';
            
            if ((daily > 0) && (daily <= intDaysInMonth))
            {
                cell.innerText = daily;
                daily++;
            }
            else
                cell.innerText = "";
        }
}

function GetDate(InputBox)
{
    var sDate;
    //这段代码处理鼠标点击的情况

    if (event.srcElement.tagName == "TD")
        if (event.srcElement.innerText != "")
        {
            sDate = document.all.Year.value + "-" + document.all.Month.value + "-" + event.srcElement.innerText;
            eval("document.all."+InputBox).value=sDate;
            HiddenCalendar();
        }
}

function HiddenCalendar()
{
    //关闭选择窗口

    document.all.Calendar.style.visibility='hidden';
}

function ShowCalendar(InputBox)
{
    var x,y,intLoop,intWeeks,intDays;
    var DivContent;
    var year,month,day;
    //var o=document.getElementById(InputBox);

    var o=InputBox;
    var oid=o.id;
    var thisyear; //真正的今年年份

    
    if(!oid)oid=o.name;
    
    thisyear=new getToday();
    thisyear=thisyear.year;
    
    today = o.value;
    if(isDate(today))
        today = new getStringDay(today);
    else
        today = new getToday();
    
    //显示的位置

    x=o.offsetLeft;
    y=o.offsetTop;
    while(o=o.offsetParent)
    {
        x+=o.offsetLeft;
        y+=o.offsetTop;
    }
    document.all.Calendar.style.left=x+2;
    document.all.Calendar.style.top=y+20;
    document.all.Calendar.style.visibility="visible";
    
    //下面开始输出日历表格(border-color:#9DBAF7)

    DivContent="";
    DivContent+="";
    DivContent+="";
    
    DivContent+="";
    DivContent+="";
    
    DivContent+="

";          //年     DivContent+="";     for (intLoop = thisyear - 100; intLoop < (thisyear + 2); intLoop++)         DivContent+="+ intLoop + " " + (today.year == intLoop ? "Selected" : "") + ">" + intLoop + "";     DivContent+="";          //月     DivContent+="";     for (intLoop = 0; intLoop < months.length; intLoop++)         DivContent+="+ (intLoop + 1) + " " + (today.month == intLoop ? "Selected" : "") + ">" + months[intLoop] + "";     DivContent+="";          DivContent+="

S

";     DivContent+="";          //星期     DivContent+="";     for(intLoop = 0; intLoop < days.length; intLoop++)         DivContent+="";     DivContent+="";          //天     for(intWeeks = 0; intWeeks < 6; intWeeks++)     {         DivContent+="";         for(intDays = 0; intDays < days.length; intDays++)             DivContent+="";         DivContent+="";     }     DivContent+=" " + days[intLoop] + "

";

    document.all.Calendar.innerHTML=DivContent;
    newCalendar();
}

function isDate(dateStr)
{
    var datePat = /^(\d{4})(\-)(\d{1,2})(\-)(\d{1,2})$/;
    var matchArray = dateStr.match(datePat);
    if (matchArray == null) return false;
    var month = matchArray[3];
    var day = matchArray[5];
    var year = matchArray[1];
    if (month < 1 || month > 12) return false;
    if (day < 1 || day > 31) return false;
    if ((month==4 || month==6 || month==9 || month==11) && day==31) return false;
    if (month == 2)
    {
        var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
        if (day > 29 || (day==29 && !isleap)) return false;
    }
    return true;
}
</script>
<style type="text/css">
<!--
td,input {
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 12px;
}
-->
</style>

 

在需要使用的空间中调用：

选择你的出生日期：<INPUT TYPE="text" NAME="marktime" readonly="readonly" onClick="javascript:ShowCalendar(this)" size="20">

 

很方便实用的代码