<title>无标题页</title>
<script language="javascript" type="text/javascript">
var t;
function show() {
var date = new Date(); //日期对象
var now = "";
now = date.getFullYear() + "年"; //读英文就行了
now = now + (date.getMonth() + 1) + "月"; //取月的时候取的是当前月-1如果想取当前月+1就可以了
now = now + date.getDate() + "日";
now = now + date.getHours() + "时";
now = now + date.getMinutes() + "分";
now = now + date.getSeconds() + "秒";
document.getElementById("nowDiv").innerHTML = now; //div的html是now这个字符串
t= setTimeout("show()", 1000); //设置过1000毫秒就是1秒，调用show方法
}
function stopCount() {
clearTimeout(t)
}
</script>
</head>
<body onload="show()">
<form id="form1" runat="server">
<div>
<div id="nowDiv"></div>
<input type="button" onclick="stopCount()" value="停止计时" />
<input type="button" onclick="show()" value="继续计时" />
</div>
</form>
</body>
</html>
原文：http://www.cnblogs.com/zhouzhilong/p/4680589.html