第一次自己成功写成的js程序

今天有点小鸡动写了一个个人js史上的第一个功能信js插件感觉做完之后特别有成就感！要得就是这种感觉啊下面我把代码贴出来欢迎吐槽
<!DOCTYPE html>
<html xmlns=http://www.w3.org/1999/xhtml>
<script type="text/javascript" src="../jquery-1.9.1.min.js"></script>
<head>
    <title></title>
    <meta http-equiv="content-type" content="text/html;charset=utf-8">
    <meta name="Keywords" content=""/>
    <meta name="Description" content=""/>
    <style type="text/css">
        *{padding:0;margin:0;}
        .box{width: 700px;margin: 0 auto;border: solid 2px gray;}
        .hd{height: 50px;position: relative;}
        .week{height: 50px;border-top:solid 1px gray;}
        .week span{float: left;width:100px;height: 50px;line-height:50px;text-align:center;width:100px;}
        .left{position: absolute;width: 100px;height: 50px;line-height: 50px;left:0;top:0;cursor:pointer;}
        .year{position: absolute;width: 500px;height: 50px;line-height: 50px;text-align: center;left:100px;top:0;}
        .right{position: absolute;width: 100px;height: 50px;line-height: 50px;right:0;top:0;cursor:pointer;}
        .day{overflow: hidden;list-style:none;}
        .day li{float: left;width: 100px;height: 100px;text-align: center;line-height: 100px;font-size: 30px;}
        .no{background: #ededed;color: gray;}
    </style>
</head>
<body>
<div class="box">
    <h1 class="hd">
        <i class="left">Left</i>
        <i class="year"></i>
        <i class="right">Right</i>
    </h1>
    <p class="week">
        <span>日</span><span>一</span><span>二</span><span>三</span><span>四</span><span>五</span><span>六</span>
    </p>
    <ul class="day">

    </ul>
</div>
</body>
</html>
<script type="text/javascript">
$(function(){
    var time = new Date();
    var nYear = time.getFullYear();
    var nMonth = time.getMonth()+1;
    creatTable(nYear,nMonth);

    $('.left').click(function(){
        nMonth--;
        if(nMonth==0){
            nYear--;
            nMonth = 12;
        }
        creatTable(nYear,nMonth);
    });
    $('.right').click(function(){
        nMonth++;
        if(nMonth == 13){
            nYear++;
            nMonth = 1;
        }
        creatTable(nYear,nMonth);
    });

    function creatTable(_year,_month){
        var dayNub = 0;
        var day30 = [4,6,9,11];
        var day31 = [1,3,5,7,8,10,12];

        if(inArray(day30,_month)){
            dayNub = 30;
        }else if(inArray(day31,_month)){
            dayNub = 31;
        }else{
            if(nYear%4 == 0 && nYear%100 != 0 && nYear%400 ==0){
                dayNub = 29;
            }else{
                dayNub = 28;
            }
        }

        $('.year').html(_year+'/'+_month);
        $('.day').html('');
        for(var i=0;i<7;i++){
            var firstWeek = compute(_year,_month);
            if(i<firstWeek){
                $('.day').html($('.day').html()+'<li></li>');
            }
        };
        for(var i=1;i<=dayNub;i++){
            $('.day').html($('.day').html()+'<li>'+i+'</li>');
        }

        function compute(_year,_month){
            var day = new Date(Date.parse(_year+'/'+_month+'/'+1));                             //将日期值格式化
            return day.getDay();                                                                //返一个星期中的某一天，其中0为星期日
        };
        function inArray(attr,value){
            for(var i in attr){
                if(attr[i] == value){
                    return true;
                };
            };
            return false;
        };
    }

});
</script>