为啥要用setTimeout()循环,直接用setInterval不是更好吗??而且Settime啥时候结束调用??

<!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);

  }

    document.write(num);

</script>

</head>

<body>

<form>

<input type="text" id="count" onclick=startCount()/>

</form>

</body>

</html>

比如这个例子


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