为什么这样写代码不能循环
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计时器</title>
<script type="text/javascript">
var num=0;
setTimeout(function startCount() {
document.getElementById('count').value=num;
num=num+1;
setTimeout("startCount()",1000);
},1000);
</script>
</head>
<body>
<form>
<input type="text" id="count" />
</form>
</body>
</html>
qq_迸发激情_0浏览 2081回答 3
3回答
-
慕的地8582982
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
小郎Lie
我也很好奇为什么必须把setTimeout("startCount()", 1000); 改成setTimeout(startCount, 1000); 虽然调试的结果确实是当使用setTimeout("startCount()", 1000);的时候，浏览器居然会报错VM325:1 Uncaught ReferenceError: startCount is not defined at <anonymous>:1:1更神奇的是，如果我用setTimeout(startCount(),1000); 调试运行居然会一直调用startCount()，导致浏览器报错setTimeOut.html:8求大神解答 -
qq_迸发激情_0
为什么要这样改setTimeout("startCount()", 1000); 改成setTimeout(startCount, 1000); 上面的不是等效的吗? -
hahhhha
下面的代码试一下效果。<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>计时器</title> </head> <body> <form> <input type="text" id="count" /> </form> </body> <script type="text/javascript"> (function(){ var ele = document.getElementById('count'), num = 0; var startCount =function(){ ele.value = num++; setTimeout(startCount,1000); }; startCount(); }()); </script> </html>
随时随地看视频慕课网APP
相关分类
JavaScript