<!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>這串代碼，調(diào)用函數(shù)哪里不加括號(hào)就是對(duì)的，加了括號(hào)就會(huì)錯(cuò)誤顯示數(shù)字，然后還有為什么還有一種是加括號(hào)還加雙引號(hào)？ ? ?可是為什么setInterval加不加括號(hào)就會(huì)正確。。。請(qǐng)高手詳解。謝謝
關(guān)于setInterval和setTimeout中參數(shù)括號(hào)的問(wèn)題
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2017-04-15 15:54:00