为什么sum能无限循环加

源自：8-5 计时器setTimeout()

为什么sum能无限循环加

<!DOCTYPE HTML>

<html>

<head>

<script type="text/javascript">

var num=0;

function numCount(){

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

num=num+1;

setInterval("numCount()",1000);

}

</script>

</head>

<body>

<form>

<input type="text" id="txt" />

<input type="button" value="Start" onClick="numCount()" />

</form>

</body>

</html>

提问者：qq_曾婷红 2018-05-07 12:07

个回答

syousyou

2018-05-07 13:24:41

已采纳

因为函数numCount()调用了自己

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