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代码……运行不粗来

<!DOCTYPE HTML>

<html>

<head>

</head>

var num=0;

function startCount() {

document.getElementById('count').value=num;

num=num+1;

setTimeout("numCount()",1000);

}

</script>

</head>

<body>

<form>

</form>

</body>

</html>

努力做梦打怪兽

2015-06-20

源自：JavaScript进阶篇 8-5

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1 回答

不断滴自我催眠
2015-06-21

你的function startContent ```调用的名称却是 numCount
setTimeout里使用方法方式不对

<!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 numCount() {
    document.getElementById('count').value=num;
    num=num+1;
    setTimeout(numCount,1000); 
  }
  
</script>
</head>
<body>
<form>
<input type="text" id="count" />
<input type="button" value="start" onclick="numCount()">
</form>
</body>
</html>