javascript做的日历，完全对象化，望高手提出改进意见。（2/3，将3部分拼成一个html文件浏览）

  this.GetTextDate = function(theString){ //convert a string to a date, if the string is not a date, return a empty string
    var i = 0, tmpChar = "", find_tag = "";
    var start_at = 0, end_at = 0, year_at = 0, month_at = 0, day_at = 0;
    var tmp_at = 0, one_at = 0, two_at = 0, one_days = 0, two_days = 0;
    var aryDate = new Array();
    var tmpYear = -1, tmpMonth = -1, tmpDay = -1;
    var tmpDate = theString.toLowerCase();
    var defDate = "";
    end_at = tmpDate.length;
    for (i=1;i<end_at;i++){
      if (tmpDate.charAt(i)=="0"){
        tmpChar = tmpDate.charAt(i-1);
        if (tmpChar<"0" || tmpChar>"9"){
          tmpDate = tmpDate.substr(0,i-1) + "-" + tmpDate.substr(i+1);
        }
      }
    }
    for (i=0;i<9;i++){
      tmpDate = tmpDate.replace(this.MonthName[i].toLowerCase().substr(0,3), "-00" + (i+1).toString() + "-");
    }
    for (i=9;i<12;i++){
      tmpDate = tmpDate.replace(this.MonthName[i].toLowerCase().substr(0,3), "-0" + (i+1).toString() + "-");
    }
    tmpDate = tmpDate.replace(/jan/g, "-001-");
    tmpDate = tmpDate.replace(/feb/g, "-002-");
    tmpDate = tmpDate.replace(/mar/g, "-003-");
    tmpDate = tmpDate.replace(/apr/g, "-004-");
    tmpDate = tmpDate.replace(/may/g, "-005-");
    tmpDate = tmpDate.replace(/jun/g, "-006-");
    tmpDate = tmpDate.replace(/jul/g, "-007-");
    tmpDate = tmpDate.replace(/aug/g, "-008-");
    tmpDate = tmpDate.replace(/sep/g, "-009-");
    tmpDate = tmpDate.replace(/oct/g, "-010-");
    tmpDate = tmpDate.replace(/nov/g, "-011-");
    tmpDate = tmpDate.replace(/dec/g, "-012-");
    for (i=0;i<tmpDate.length;i++){
      tmpChar = tmpDate.charAt(i);
      if ((tmpChar<"0" || tmpChar>"9") && (tmpChar != "-")){
        tmpDate = tmpDate.replace(tmpChar,"-")
      }
    }
    while(tmpDate.indexOf("--") != -1){
      tmpDate = tmpDate.replace(/--/g,"-");
    }
    start_at = 0;
    end_at = tmpDate.length-1;
    while (tmpDate.charAt(start_at)=="-"){
      start_at++;
    }
    while (tmpDate.charAt(end_at)=="-"){
      end_at--;
    }
    if (start_at < end_at+1){
      tmpDate = tmpDate.substring(start_at,end_at+1);
    }else{
      tmpDate = "";
    }
    aryDate = tmpDate.split("-");
    if (aryDate.length != 3){
      return(defDate);
    }
    for (i=0;i<3;i++){
      if (parseInt(aryDate[i],10)<1){
        aryDate[i] = "1";
      }
    }
    find_tag="000";
    for (i=2;i>=0;i--){
      if (aryDate[i].length==3){
        if (aryDate[i]>="001" && aryDate[i]<="012"){
          tmpMonth = parseInt(aryDate[i],10)-1;
          switch (i){
            case 0:
              find_tag = "100";
              one_at = parseInt(aryDate[1],10);
              two_at = parseInt(aryDate[2],10);
              break;
            case 1:
              find_tag = "010";
              one_at = parseInt(aryDate[0],10);
              two_at = parseInt(aryDate[2],10);
              break;
            case 2:
              find_tag = "001";
              one_at = parseInt(aryDate[0],10);
              two_at = parseInt(aryDate[1],10);
              break;
          }
        }
      }
    }
    if (find_tag!="000"){
      one_days = this.GetMonthDays(two_at,tmpMonth);
      two_days = this.GetMonthDays(one_at,tmpMonth);
      if ((one_at>one_days)&&(two_at>two_days)){
        return(defDate);
      }
      if ((one_at<=one_days)&&(two_at>two_days)){
        tmpYear = this.GetFormatYear(two_at);
        tmpDay = one_at;
      }
      if ((one_at>one_days)&&(two_at<=two_days)){
        tmpYear = this.GetFormatYear(one_at);
        tmpDay = two_at;
      }
      if ((one_at<=one_days)&&(two_at<=two_days)){
        tmpYear = this.GetFormatYear(one_at);
        tmpDay = two_at;
        tmpDate = this.DateFormat;
        year_at = tmpDate.indexOf("<yyyy>");
        if (year_at == -1){
          year_at = tmpDate.indexOf("<yy>");
        }
        day_at = tmpDate.indexOf("<dd>");
        if (day_at == -1){
          day_at = tmpDate.indexOf("<d>");
        }
        if (year_at >= day_at){
          tmpYear = this.GetFormatYear(two_at);
          tmpDay = one_at;
        }
        }
      return(new Date(tmpYear, tmpMonth, tmpDay));
    }
    find_tag = "000";
    for (i=2;i>=0;i--){
      if (parseInt(aryDate[i],10)>31){
        tmpYear = this.GetFormatYear(parseInt(aryDate[i],10));
        switch (i){
          case 0:
            find_tag = "100";
            one_at = parseInt(aryDate[1],10);
            two_at = parseInt(aryDate[2],10);
            break;
          case 1:
            find_tag = "010";
            one_at = parseInt(aryDate[0],10);
            two_at = parseInt(aryDate[2],10);
            break;
          case 2:
            find_tag = "001";
            one_at = parseInt(aryDate[0],10);
            two_at = parseInt(aryDate[1],10);
            break;
        }
      }
    }
    if (find_tag=="000"){
      tmpDate = this.DateFormat;
      year_at = tmpDate.indexOf("<yyyy>");
      if (year_at == -1){
        year_at = tmpDate.indexOf("<yy>");
      }
      month_at = tmpDate.indexOf("<MMMMMM>");
      if (month_at == -1){
        month_at = tmpDate.indexOf("<MMM>");
      }
      if (month_at == -1){
        month_at = tmpDate.indexOf("<mm>");
      }
      if (month_at == -1){
        month_at = tmpDate.indexOf("<m>");
      }
      day_at = tmpDate.indexOf("<dd>");
      if (day_at == -1){
        day_at = tmpDate.indexOf("<d>");
      }
      if ((year_at>month_at)&&(year_at>day_at)){
        find_tag="001"
      }
      if ((year_at>month_at)&&(year_at<=day_at)){
        find_tag="010";
      }
      if ((year_at<=month_at)&&(year_at>day_at)){
        find_tag="010";
      }
      if ((year_at<=month_at)&&(year_at<=day_at)){
        find_tag="100";
      }
      switch (find_tag){
        case "100":
          tmpYear = parseInt(aryDate[0],10);
          one_at = parseInt(aryDate[1],10);
          two_at = parseInt(aryDate[2],10);
          break;
        case "010":
          one_at = parseInt(aryDate[0],10);
          tmpYear = parseInt(aryDate[1],10);
          two_at = parseInt(aryDate[2],10);
          break;
        case "001":
          one_at = parseInt(aryDate[0],10);
          two_at = parseInt(aryDate[1],10);
          tmpYear = parseInt(aryDate[2],10);
          break;
      }
      tmpYear = this.GetFormatYear(tmpYear);
    }
    if (find_tag!="000"){
      if ((one_at>12)&&(two_at>12)){
        return(defDate);
      }
      if (one_at<=12){
        if (two_at > this.GetMonthDays(tmpYear,one_at-1)){
          return(new Date(tmpYear, one_at-1, this.GetMonthDays(tmpYear,one_at-1)));
        }
        if (two_at>12){
          return(new Date(tmpYear, one_at-1, two_at));
        }
      }
      if (two_at<=12){
        if (one_at > this.GetMonthDays(tmpYear,two_at-1)){
          return(new Date(tmpYear, two_at-1, this.GetMonthDays(tmpYear,two_at-1)));
        }
        if (one_at>12){
          return(new Date(tmpYear, two_at-1, one_at));
        }
      }
      if ((one_at<=12)&&(two_at<=12)){
        tmpMonth = one_at-1;
        tmpDay = two_at;
        tmpDate = this.DateFormat;
        month_at = tmpDate.indexOf("<MMMMMM>");
        if (month_at == -1){
          month_at = tmpDate.indexOf("<MMM>");
        }
        if (month_at == -1){
          month_at = tmpDate.indexOf("<mm>");
        }
        if (month_at == -1){
          month_at = tmpDate.indexOf("<m>");
        }
        day_at = tmpDate.indexOf("<dd>");
        if (day_at == -1){
          day_at = tmpDate.indexOf("<d>");
        }
        if (month_at >= day_at){
          tmpMonth = two_at-1;
          tmpDay = one_at;
        }
         return(new Date(tmpYear, tmpMonth, tmpDay));
      }
    }
  }
  this.CreateYearList = function(MinYear, MaxYear){ //create year list
    var theName = this.Name;
    var theYearObject = document.all.item(theName + "_YearList");
    if (theYearObject == null){
      return;
    }
    var theYear = 0;
    var theYearHTML = "<select id=\"" + theName + "_YearList\" style=\"" + this.YearListStyle + "\" tabIndex=\"-1\" onChange=\"document.jsMonthView.UpdateMonthGrid(this)\" onBlur=\"document.jsMonthView.DeleteMonthGrid()\">";
    for (theYear = MinYear; theYear <= MaxYear; theYear++){
      theYearHTML += "<option value=\"" + theYear.toString() + "\">" + theYear.toString() + "</option>";
    }
    theYearHTML += "</select>";
    theYearObject.outerHTML = theYearHTML;
  }
  this.CreateMonthList = function( ){ //create month list
    var theName = this.Name;
    var theMonthObject = document.all.item(theName + "_MonthList");
    if (theMonthObject == null){
      return;
    }
    var theMonth = 0;
    var theMonthHTML = "<select id=\"" + theName + "_MonthList\" style=\"" + this.MonthListStyle + "\" tabIndex=\"-1\" onChange=\"document.jsMonthView.UpdateMonthGrid(this)\" onBlur=\"document.jsMonthView.DeleteMonthGrid()\">";
    for (theMonth = 0; theMonth < 12; theMonth++){
      theMonthHTML += "<option value=\"" + theMonth.toString() + "\">" + this.MonthName[theMonth] + "</option>";
    }
    theMonthHTML +="</select>";
    theMonthObject.outerHTML = theMonthHTML;
  }
  this.setDayList = function(theYear, theMonth, theDay){ //set the month view show a date
    var theName = this.Name;
    var theDayObject = document.all.item(theName + "_DayList");
    if (theDayObject == null){
      return;
    }
    theDayObject.value = theDay.toString();
    var theFirstDay = new Date(theYear, theMonth, 1);
    var theCurrentDate = new Date();
    var theWeek = theFirstDay.getDay();
    if (theWeek == 0){
      theWeek = 7;
    }
    var theLeftDay = 0;
    if (theMonth == 0){
      theLeftDay = 31;
    }else{
      theLeftDay = this.GetMonthDays(theYear, theMonth - 1);
    }
    var theRightDay = this.GetMonthDays(theYear, theMonth);
    var theCurrentDay = theLeftDay - theWeek + 1;
    var offsetMonth = -1; //the month is previous month
    var theColor = this.InvalidColor;
    var theBgColor = this.UnselectBgColor;
    var theBdColor = theBgColor;
    var WeekId = 0
    var DayId = 0;
    var theStyle = "";
    var theDayHTML = "<table width=\"100%\" height=\"100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">";
    theDayHTML += "        <tr style=\"" + this.TitleStyle + "\">";
    for (DayId = 0; DayId < 7; DayId++){
      theDayHTML += "        <td width=\"10%\">" + this.WeekName[DayId] + "</td>";
    }
    theDayHTML += "        </tr>";
    theDayHTML += "        <tr>";
    theDayHTML += "            <td colspan=\"7\" style=\"" + this.LineBgStyle + "\">";
    theDayHTML += "                <table style=\"" + this.LineStyle + "\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">";
    theDayHTML += "                    <tr><td></td></tr>";
    theDayHTML += "                </table>";
    theDayHTML += "            </td>";
    theDayHTML += "        </tr>";
    for (WeekId = 0; WeekId < 6; WeekId++){
      theDayHTML += "    <tr style=\"" + this.DayStyle + "\">";
      for (DayId = 0; DayId < 7; DayId++){
        if ((theCurrentDay > theLeftDay) && (WeekId < 3)){
          offsetMonth++; //the month is current month;
          theCurrentDay = 1;
        }
        if ((theCurrentDay > theRightDay) && (WeekId > 3)){
          offsetMonth++; //the month is next month;
          theCurrentDay = 1;
        }
        switch (offsetMonth){
          case -1:
            theColor = this.InvalidColor;
            break;
        case 1:
            theColor = this.InvalidColor;
            break;
        case 0:
            if ((DayId==0)||(DayId==6)){
              theColor = this.WeekendColor;
            }else{
              theColor = this.ValidColor;
            }
            break;
        }
        if ((DayId==0)||(DayId==6)){
          theBgColor = this.WeekendBgColor;
        }else{
          theBgColor = this.UnselectBgColor;
        }
        theBdColor = this.DayBdColor;
        if ((theCurrentDay == theDay) && (offsetMonth == 0)){
          theColor = this.SelectedColor;
          theBgColor = this.SelectedBgColor;
          theBdColor = theBgColor;
        }
        if ((theYear == theCurrentDate.getFullYear()) && (theMonth == theCurrentDate.getMonth()) && (theCurrentDay == theCurrentDate.getDate()) && (offsetMonth == 0)){
          theBdColor = this.TodayBdColor;
        }
        theStyle = "border:" + this.DayBdWidth + "px solid " + theBdColor + "; color:" + theColor + "; background-color:" + theBgColor + ";";
        theDayHTML += "        <td style=\"" + theStyle + "\" onMouseOver=\"" + this.OverDayStyle + "\" onMouseOut=\"" + this.OutDayStyle + "\" onMouseDown=\"document.jsMonthView.CreateMonthGrid(" + theYear.toString() + ", " + (theMonth + offsetMonth).toString() + ", " + theCurrentDay.toString() + ")\">";
        theDayHTML += theCurrentDay.toString();
        theDayHTML += "        </td>";
        theCurrentDay++;
      }
      theDayHTML += "    </tr>";
    }
    theDayHTML += "        <tr style=\"" + this.FooterStyle + "\" onMouseDown=\"document.jsMonthView.CreateMonthGrid(" + theCurrentDate.getFullYear().toString() + ", " + theCurrentDate.getMonth().toString() + ", " + theCurrentDate.getDate().toString() + ");\">";
    theStyle = "border:" + this.DayBdWidth + "px solid " + this.TodayBdColor + ";";
    theDayHTML += "            <td style=\"" + theStyle + "\"><br></td>";
    theDayHTML += "            <td colspan=\"6\"> " + this.TodayTitle + " " + this.SetDateFormat(theCurrentDate.getFullYear(), theCurrentDate.getMonth(), theCurrentDate.getDate()) + "</td>";
    theDayHTML += "        </tr>";
    theDayHTML += "    </table>";
    var theMonthGrid = document.all.item(theName + "_MonthGrid");
    theMonthGrid.innerHTML = theDayHTML;
  }

原文转自：http://www.ltesting.net