<!DOCTYPE?HTML>
<html>
<head>
<script?type="text/javascript">
var?num=0;
function?numCount(){
?document.getElementById('txt').value=num;
?num=num+1;
?setTimeout("numCount()",1000);
?}
</script>
</head>
<body>
<form>
<input?type="text"?id="txt"?/>
<input?type="button"?value="Start"?onClick="numCount()"?/>
</form>
</body>
</html>為什么一直點擊按鈕時，計數(shù)會加快？
課程中setTimeout第三個示例程序中有疑問，求
qq_伏特加_0
2016-09-16 11:33:11
