JavaScript原生秒表、计时器

可以开始、暂停、清除。

效果图：

下面贴代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>计时器</title>
    <script>
        var hour,minute,second;//时 分 秒
        hour=minute=second=0;//初始化
        var millisecond=0;//毫秒
        var int;
        function Reset()//重置
        {
            window.clearInterval(int);
            millisecond=hour=minute=second=0;
            document.getElementById('timetext').value='00时00分00秒000毫秒';
        }
 
        function start()//开始
        {
            int=setInterval(timer,50);
        }
 
        function timer()//计时
        {
            millisecond=millisecond+50;
            if(millisecond>=1000)
            {
                millisecond=0;
                second=second+1;
            }
            if(second>=60)
            {
                second=0;
                minute=minute+1;
            }
 
            if(minute>=60)
            {
                minute=0;
                hour=hour+1;
            }
            document.getElementById('timetext').value=hour+'时'+minute+'分'+second+'秒'+millisecond+'毫秒';
 
        }
 
        function stop()//暂停
        {
            window.clearInterval(int);
        }
    </script>
</head>
<body>
<div style="text-align: center">
    <input type="text" id="timetext" value="00时00分00秒" readonly><br>
    <button type="button" onclick="start()">开始</button> <button type="button" onclick="stop()">暂停</button> <button type="button" onclick="Reset()">重置</button>
</div>
</body>
</html>