<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>计时器</title>
</head>
<body>
<form id="form1" name="form1" method="post" action="">
<input type="text" name="num" size="1" value="0" />
<input type="button" name="start" value="开始计时" onclick="sta();" />
<input type="button" name="pause" value="暂停计时" onclick="pau();" />
</form>
<script language="javascript">
var flag=0;
var timeID;
function beg(){
var i=form1.num.value;
i++;
form1.num.value=i;
timeID=setTimeout("beg()",1000);
}
function sta(){
if(flag==0){
beg();
flag=1;
}
}
function pau(){
clearTimeout(timeID);
flag=0;
}
</script>
</body>
</html>
