<html>
<head>
<meta charset="utf-8">
<title>定时警告</title>
</head>
<body>
<!--定时警告的问题-->
<h1>定时警告的问题</h1>
<input type="button" value="定时警告" onclick="setTimeMsg()"/>
<script language="javascript">
function setTimeMsg(){
setTimeout('alert("hello world!!!")',3000);//3s
}
</script>
<hr>
<!--计数器-->
<h1>计数器</h1>
<input type="button" value="开始计时" onclick="startTime()"/>
<input type="text" id="num"/><br>
<input type="button" value="结束计时" onclick="stopTime()"/>
<script language="javascript">
var i=0;
var t;
function startTime(){
document.getElementById("num").value=i;
i=i+1;
t=setTimeout("startTime()",10);//1s
}
function stopTime(){
clearTimeout(t);
}
</script>
</body>
</html>
<html>
<head>
<meta charset="utf-8">
<title>定时警告</title>
</head>
<body onload="startTime()">
<h1>秒表<div id="time"></div></h1>
<script language="javascript">
function startTime(){
var date=new Date();
var year=date.getFullYear();
var month=date.getMonth()+1;
var day=date.getDate();
var hour=date.getHours();
var minute=date.getMinutes();
var second=date.getSeconds();
//var str=year+"年"+month+"月"+day+"日"+hour+":"+minute+":"+second;
var str=hour+":"+minute+":"+second;
document.getElementById("time").innerHTML=str;
setTimeout("startTime()",1000);
}
</script>
</body>
</html>
Javascript实现计数器，定时警告和停止的相关教程结束。
