JavaScript Calendar

標題：JavaScript年曆範例
JavaScript (index.html)：

<script type="text/javascript">
var codeboxy = new function() {
    var year = new Date().getFullYear();
    return {
        refresh : function() { //刷新年曆
            year = document.getElementById("getyear").value;
            document.getElementById("show").innerHTML = "";
            this.init();
        },
        showmonth : function(s, m) { //列印月份
            var output = "";
            var day=1;
            output += " SUN MON TUE WED THU FRI SAT\n";
            for(var i=1;i<=m+s;i++) {
                if(i<=s) {
                    output += "    ";
                } else {
                    output += "  " + this.zero(day);
                    if((i%7)==0) 
                        output += "\n";
                    day++;
                }
            }
            output += "\n";
            return output;
        },
        zero : function(num) { //空格補償
            if(num<10)
                num = " " + num;
            return num;
        },
        init : function() { //初始年曆參數
            space = ((year-1)+parseInt((year-1)/4)-parseInt((year-1)/100)+parseInt((year-1)/400)+1)%7;
            for(m=1;m<=12;m++) {
                if(m==4||m==6||m==9||m==11)
                    month=30;
                else if(m==2&&(year-1980)%4==0)
                    month=29;
                else if(m==2)
                    month=28;
                else
                    month=31;
                document.getElementById("show").innerHTML += "\nMonth: " + m + "\n" + this.showmonth(space,month);
                space=(space+month)%7;
            }
        }
    };
};
window.onload = function () {
    codeboxy.init();
};
</script>
Year: <input type="text" id="getyear" />
<button onclick="codeboxy.refresh();">Get</button>
<pre id="show"></pre>

說明：
以JavaScript採Class方式撰寫年曆範例程式。

範例：
Year: