<!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,調用函數哪里不加括號就是對的,加了括號就會錯誤顯示數字,然后還有為什么還有一種是加括號還加雙引號? ? ?可是為什么setInterval加不加括號就會正確。。。請高手詳解。謝謝
關于setInterval和setTimeout中參數括號的問題
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2017-04-15 15:54:00