前端JS如何獲取日曆

<script type="text/javascript">
	    function getSysDate(){
			var time = new Date();
			var month = ((time.getMonth()+1)+"").length < 2?"0"+(time.getMonth()+1):(time.getMonth()+1);
			var dates = (time.getDate()+"").length < 2?"0"+time.getDate():time.getDate();
			var minute = (time.getMinutes()+"").length < 2?"0"+time.getMinutes():time.getMinutes();
			var hours = (time.getHours()+"").length < 2?"0"+time.getHours():time.getHours();
			var minute = (time.getMinutes()+"").length < 2?"0"+time.getMinutes():time.getMinutes();
			var second = (time.getSeconds()+"").length < 2?"0"+time.getSeconds():time.getSeconds();
			var s = time.getFullYear()+"年"+month+"月"+dates+"日 "+hours+":"+minute+":"+second+" "+getWeek(time);
			$("#date_div").text(s);// 裝日曆的容器
		}
	    function getWeek(date){
	    	var week = date.getDay();  
	    	var str = "";
	    	if (week == 0) {  
	    	        str = "星期日";  
	    	} else if (week == 1) {  
	    	        str = "星期一";  
	    	} else if (week == 2) {  
	    	        str = "星期二";  
	    	} else if (week == 3) {  
	    	        str = "星期三";  
	    	} else if (week == 4) {  
	    	        str = "星期四";  
	    	} else if (week == 5) {  
	    	        str = "星期五";  
	    	} else if (week == 6) {  
	    	        str = "星期六";  
	    	} 
	    	return str;
	    }
	    getSysDate();
		setInterval("getSysDate()",1000);
    </script>