javascript系统时间设置

<script>    //myTime typeof //object    window.onload = function() {        var obody = document.body;        //设置一个定时器，每过一秒钟，自动加一秒        setInterval(fnTime, 1000)        //如果不执行这个函数，第一次打开时，会过一秒钟才出来        fnTime();        function fnTime() {            var myTime = new Date();            var iYear = myTime.getFullYear();            var iMonth = myTime.getMonth() + 1;            var iDate = myTime.getDate();            var iWeek = myTime.getDay();            var iHours = myTime.getHours();            var iMinutes = myTime.getMinutes();            var iSeconds = myTime.getSeconds();            var str = "";            if(iWeek === 0) iWeek = "星期日"            if(iWeek === 1) iWeek = "星期一"            if(iWeek === 2) iWeek = "星期二"            if(iWeek === 3) iWeek = "星期三"            if(iWeek === 4) iWeek = "星期四"            if(iWeek === 5) iWeek = "星期五"            if(iWeek === 6) iWeek = "星期六"            str = iYear + "年" + iMonth + "月" + iDate + "日 " + iWeek + " " + toTwo(iHours) + "时" + toTwo(iMinutes) + "分" + toTwo(iSeconds) + "秒"            obody.innerHTML = str;        }        alert(toTwo(05))//05        alert(toTwo(15))//15        //这个函数主要是让:时分秒到59秒时，再走一秒就变成了0，而不是00，所以要转换一下        function toTwo(n) {            /*             if(n < 10) {             return "0" + n;             } else {             return "" + n;             }             */            //我们可以用三目            return n < 10 ? "0" + n : "" + n        }    }</script>