<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计时器</title>
</head>
<script type="text/javascript">
var num=0;
function startCount(){
document.getElementById('count').value=num;
num=num+1;
setTimeout("startCount()",1000);
}
//setTimeout("startCount()",1000);//最外层表示启动该函数,函数内部自调用
</script>
</head>
<body>
<form>
<input type="text" id="count" click="startCount()"/>
<input type="button" oclick="startCount()" value="start"/>
</form>
</body>
</html>
<input type="text" id="count" click="startCount()"/> //这句代码不要 click="startCount()",而且你还漏了on;反正不要这半句就行
按钮的那句应该是:<input type="button" value="Start" onclick="numCount()">
不只是码错,你设按钮的话多次调用但是同时没有clear掉,就会出现加速的效果
<input type="button" value="Start" onClick="numCount()"/>
你写错了.....是onclick....