源码学习:一个简单的日历控件

   if(defaultDate==undefined || defaultDate==""){
    var theDate=new Array();
    calendar.head.innerText = calendar.today[0]+"-"+calendar.today[1]+"-"+calendar.today[2];
    theDate[0]=calendar.today[0]; theDate[1]=calendar.today[1]; theDate[2]=calendar.today[2];
   }
   else{
    var reg=/^\d{4}-\d{1,2}-\d{2}$/
    if(!defaultDate.match(reg)){
     alert("默认日期的格式不正确\n\n默认日期可接受格式为:'yyyy-mm-dd'");
     return;
    }
    var theDate=defaultDate.split("-");
    calendar.head.innerText = defaultDate;
   }
   calendar.currentDate[0]=theDate[0];
   calendar.currentDate[1]=theDate[1];
   calendar.currentDate[2]=theDate[2];
   theFirstDay=calendar.getFirstDay(theDate[0],theDate[1]);
   theMonthLen=theFirstDay+calendar.getMonthLen(theDate[0],theDate[1]);
   //calendar.setEventKey();

   calendar.calendarPad.style.display="";
   var theRows = Math.ceil((theMonthLen)/7);
   //清除旧的日历;
   while (calendar.body.rows.length > 0) {
    calendar.body.deleteRow(0)
   }
   //建立新的日历;
   var n=0;day=0;
   for(i=0;i<theRows;i++){
    theRow=calendar.body.insertRow(i);
    for(j=0;j<7;j++){
     n++;
     if(n>theFirstDay && n<=theMonthLen){
      day=n-theFirstDay;
      calendar.insertBodyCell(theRow,j,day);
     }