为什么按开始和结果都没有反应？
<script type="text/javascript">
var num=0;
var i;
function startCount(){
document.getElementById('count').value=num;
num=num+1;
i=setTimeout("startCount()",1000);
}
function stopCount(){
clearTimeout(i);
}
</script>
</head>
<body>
<form>
<input type="text" id="count" />
<input type="button" value="Start" onClick="starCount()" />
<input type="button" value="Stop" onClick="stopCount()" />
</form>
</body>
