JavaScript日历

    function Calender()  
                {  
                    var str="日,一,二,三,四,五,六";  
                    weekArray=str.split(',');  
                    var now=new Date();  
                    this.year=now.getFullYear();  
                    this.day=now.getDay();  
                    this.month=now.getMonth()+1;  
                    this.date=now.getDate();  
                      
                  
                      
                    //定义输出函数  
                    this.print=function()  
                    {  
                  
                    //输出第一行  
                      var lineStr="<div style='width:200px' align='center'>"+  
                                       this.year+"年"+this.month+"月"  
                                       ;  
                          
                     if(this.isRunYear(this.year))  
                     lineStr+="(闰)</div>";  
                     lineStr+="<div align='center'>星期"+weekArray[this.day];  
                     lineStr+="</div>";  
                     //输出今天的日期  
                     dateStr="<div align='center'><h1>"+this.date+"</h1></div>";  
                       
                     //日历星期和日期的对应  
                     var weeks="<div align='center'><table><tr>";  
                     for (var i = 0; i < weekArray.length; i++)  
                     {  
                     weeks += "<td>" + weekArray[i] + "</td>";  
                     }  
                      weeks+="</tr>";  
                      var firstday=new Date(this.year+"/"+this.month+"/1");  
                      var fweek=firstday.getDay();  
                      theday=now.getDate();  
                      daynum=this.haveDays(this.year,this.month);  
                      for(var j=1;j<7;j++)  
                      {  
                        weeks+="<tr>";  
                        for(var i=0;i<7;i++)  
                        {  
                            theday=7*(j-1)+i+1-fweek;  
                        if ((j==0)&&i<(fweek)||(theday>daynum)||theday<=0)  
                            weeks+="<td> </td>";  
                        else  
                           weeks+="<td>"+theday+"</td>";  
                        }  
                      weeks+="</tr>";  
                       
                      }  
                      
                    weeks+="</table></div>";  
                    document.writeln(lineStr);  
                    document.writeln(dateStr);  
                    document.writeln(weeks);      
                    }  
                    //得到年该月的第一天是星期几  
                    this.getFirstDay=function()  
                     {  
                        var firstday=new Date(this.year+"/"+this.month+"/1");  
                        return firstday.getDate();  
                     }  
                    //检查是否是闰年  
                    this.isRunYear=function(year)  
                    {  
                        if((year%400==0)||((year%4==0)&&(year%100!=0)))  
                        return true;  
                        else  
                        return false;  
                    }  
                    //判断这某年某月有几天  
                    this.haveDays=function(year,month)  
                    {  
                      
                        var result=0;  
                        switch(month)  
                        {  
                            case 1:  
                            case 3:  
                            case 5:  
                            case 7:  
                            case 8:  
                            case 10:  
                            case 12:result=31;break;  
                            case 4:  
                            case 6:  
                            case 9:  
                            case 11:result=30;break;  
                            case 2:result=(isRunYear(year))?29:28;break;  
                        }  
                        return result;  
                    }  
                  
                }  
              
                window.onload=function()  
                {  
                    var calender=new Calender();  
                    calender.print();  
                  
                }