javascript写的简易定时器

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<!DOCTYPE html><html><head>    <meta charset="utf-8">    <title>定时器</title>    <script type="text/javascript">        /*var time1 = setTimeout(myalert,2000);        var time2 = setInterval(myalert,2000);        function myalert(){            alert('ok')        }*/        window.onload = function(){            var oDiv = document.getElementById('div1');            function timego(){                var now = new Date();                var year = now.getFullYear();                var month = now.getMonth()+1;                var date = now.getDate();                var week = now.getDay();                var hour = now.getHours();                var minute = now.getMinutes();                var second = now.getSeconds();                var str = '当前时间是：'+ year + '年'+month+'月'+date+'日 '+toweek(week)+' '+todou(hour)+':'+todou(minute)+':'+todou(second);                oDiv.innerHTML = str;            }            timego()            setInterval(timego,1000)        }        function toweek(n){                if(n==0)        {            return '星期日';        }        else if(n==1)        {            return '星期一';        }        else if(n==2)        {            return '星期二';        }        else if(n==3)        {            return '星期三';        }        else if(n==4)        {            return '星期四';        }        else if(n==5)        {            return '星期五';        }        else        {            return '星期六';        }        }        function todou(n){            if (n<10) {                return '0' + n;            }else{                return n;            }        }    </script></head><body>    <div id=div1></div></body></html>
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