<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计时器</title>
<script type="text/javascript">
var num=0;
function startCount() {
document.getElementById('count').value=num;
num=num+1;
setTimeout("startCount()",1000);
}
</script>
</head>
<body>
<form>
<input type="text" id="count" />
<input type="button" value="Start" onclick="startCount()">
</form>
</body>
</html>
2017-04-24
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计时器</title>
<script type="text/javascript">
var num=0;
function startCount() {
document.getElementById('count').value=num;
num=num+1;
setTimeout("startCount()",1000)
}
setTimeout("startCount()",1000)
</script>
</head>
<body>
<form>
<input type="text" id="count"/>
</form>
</body>
</html>
<!--外面那个延迟一秒执行startCount()函数，里面那个循环执行startCount()函数。外面那个主要作用就是等dom节点都加载完才执行函数。
--->我参考别人的，
举报
