用javaScript制作日历

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 这是我做出来的最终效果，界面比较简单，以后有时间会稍作修改，把界面和功能做得更加完善。

html+css代码如下：

<!DOCTYPE html>
<html>
<head>
	<title>日历</title>
	<style type="text/css">
		#div1{
			width:425px;
			height:420px;
			border:1px solid gray;
		}
		#div2{
			width: 390px;
			height: 390px;
			margin:auto;
			margin-top: 15px;
		}
		#div21{
			width: 220px;
			height: 72px;
			margin:auto;
			line-height: 72px; 
			margin:auto;
		}
		#div22{
			width: 355px;
			height: 310px;
			margin:auto;
		}
		#table1{
			width: 355px;
			height: 30px;
			border-spacing: 30px 33px;
		}
		#table2{
			width: 355px;
			height: 30px;
			line-height: 30px;
			border-spacing: 30px 0px;
		}
	</style>
	
</head>
<body>
<div id="div1">
	<div id="div2">
		<div id="div21">
		<button onclick="lastMon()">上一月</button>
		<text id="yearAndMon"></text>
		<button onclick="nextMon()">下一月</button>	
		</div>
		<div id="div22">
			<table id="table2">
				<tr>
					<td>日</td>
					<td>一</td>
					<td>二</td>
					<td>三</td>
					<td>四</td>
					<td>五</td>
					<td>六</td>
				</tr>
			</table>
			<table id="table1"></table>
		</div>
	</div>
</div>
<script type="text/javascript" src="rili.js"></script>
</body>
</html>

js代码如下：

    var nowDate=new Date();
	var nowYear=nowDate.getFullYear();
	var nowMonth=nowDate.getMonth()+1;
	//var month=(nowMonth<10?"0"+momth:month);
	var text=document.getElementById("yearAndMon");
	text.innerText=nowYear+"年"+nowMonth+"月";
	var monthDays1=[31,29,31,30,31,30,31,31,30,31,30,31]; 
	var monthDays2=[31,28,31,30,31,30,31,31,30,31,30,31]
function becomeDate(nowYear,nowMonth){
	var dt=new Date(nowYear,nowMonth-1,1);
	var firstDay=dt.getDay();
	var table=document.getElementById("table1");
	var monthDays=isRunNian();
	var rows=5;
	var cols=7;
	var k=1;
	for(var i=1;i<=rows;i++){
		var tri=table.insertRow();
		for(var j=1;j<=7;j++){
			var tdi=tri.insertCell();
			if(i==1&&i*j<firstDay+1)
				tdi.innerHTML="";
			else{
			if(k>monthDays[nowMonth-1])
				break;
			tdi.innerHTML=k;
			k++;
		}
			}

		}
}

function lastMon(){
	table1.innerHTML="";
	var text=document.getElementById("yearAndMon");
	if(nowMonth>1)
		nowMonth=nowMonth-1;
	else{
		nowYear--;
		nowMonth=12;
	}
	text.innerText=nowYear+"年"+nowMonth+"月";
	becomeDate(nowYear,nowMonth);
}

function nextMon(){
	table1.innerHTML="";
	if(nowMonth<12)
		nowMonth=nowMonth+1;
	else{
		nowYear++;
		nowMonth=1;
	}
		var text=document.getElementById("yearAndMon");
		text.innerText=nowYear+"年"+nowMonth+"月";
		becomeDate(nowYear,nowMonth);
}

function isRunNian(){
	if((nowYear%4==0||nowYear%400==0)&&nowYear%100!=0)
		return monthDays1;
	else
		return monthDays2;
}
becomeDate(nowYear,nowMonth);

代码还有很多不足之处，大家可以提出改进的意见。