<head>
<meta charset="utf-8">
<title>无标题文档</title>
<script type ="text/javascript" src="clock1/clock.js"></script>
<h2 id = "h"></h2>
<input type = "button" id = "b" value = "取消" onClick="cancel()">
<input type = "button" id = "a" value = "开始" onClick="start()">
</head>
window.onload = function(){//页面加载完成之后运行后面的代码
dd = setInterval("clock()",1000);//对方法加了一个1000ms的定时器
};
function clock(){
var time = new Date();//时间函数
var year = time.getFullYear();//获得年
var month = time.getMonth();//获得月
var day = time.getDay();//获得日
var hour = time.getHours();//获得小时
var min = time.getMinutes();//获得分钟
var sec = time.getSeconds();//获得秒
var dd = year + "-" + month + "-" + day + ":" + hour + ":" + min + ":" + sec;
document.getElementsByTagName("h2")[0].innerHTML = dd;//将时间显示到非标单中
}
function cancel(){//数字暂停
clearInterval(dd);
}
function start(){//时钟开始
dd = setInterval("clock()",1000);
}