简单的秒表实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>日期对象</title>
</head>
<body>
<div id="div">16：30：00</div>
<script>
    function getDate(){
        var myDiv = document.getElementById("div");
        var tt = new Date();
        var hover = tt.getHours(),
            minute = tt.getMinutes();
            second = tt.getSeconds();
        if(hover < 10){
            hover = "0" + hover;
        }
        if(minute < 10){
            minute = "0" + minute;
        }
        if(second < 10){
            second = "0" + second;
        }
        var time = hover+":"+minute+":"+second;
        myDiv.innerHTML = time;
    };
    getDate();//以免第一次还要等待30毫秒；
    setInterval(getDate,30)
</script>
</body>
</html>