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JavaScript實現一個數字時鐘

<html>

<head>
    <script type="text/javascript">
        function startTime() {
            var today = new Date()
            var h = today.getHours()
            var m = today.getMinutes()
            var s = today.getSeconds()
            // add a zero in front of numbers<10
            m = checkTime(m)
            s = checkTime(s)
            document.getElementById('txt').innerHTML = h + ":" + m + ":" + s
            t = setTimeout('startTime()', 500)
        }

        function checkTime(i) {
            if (i < 10) {
                i = "0" + i
            }
            return i
        }
    </script>
</head>

<body onload="startTime()">
    <div id="txt"></div>
</body>

</html>

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