為什么把 i=setTimeout("startCount()",1000);這一句放進(jìn)stopCount()里面就不行？
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>計(jì)時(shí)器</title>
</head>
<script type="text/javascript">
? var num=0;
? var i;
? function startCount(){
? ? document.getElementById('count').value=num;
? ? num=num+1;
? ? setTimeout("startCount()",1000);
? }
? function stopCount(){
? i=setTimeout("startCount()",1000);
? ? clearTimeout(i);
? }
</script>
</head>
<body>
? <form>
? ? <input type="text" id="count" />
? ? <input type="button" value="Start" onclick="startCount()" />
? ? <input type="button" value="Stop" onclick="stopCount()" ?/>
? </form>
</body>
</html>
2015-04-07
可以吧，你放在本地試試，不過(guò)你要先把stopCount這函數(shù)中的? i=setTimeout("startCount()",1000);這句話去掉