javascript寫的簡易定時器

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>定時器</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 = '當前時間是:'+ 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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