为啥越点击数字跳得越快？
<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript">
var num=0;
function numCount(){
document.getElementById('txt').value=num;
num=num+1;
setTimeout("numCount()",5000);
}
</script>
</head>
<body>
<form>
<input type="text" id="txt" />
<input type="button" value="Start" onClick="numCount()" />
</form>
</body>
</html>
像个好人浏览 1627回答 3
3回答
-
Jerps
定时器一开启，需要关闭才会消失，按了多少次就相当于开了多少个定时器，自然会不断触发num++了。解决办法：在定时器函数外先清除上一个定时器，这样再触发也只有一个定时器了！ -
慕的地8582982
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
cnyballk
那是你点击的快吧，可以在前面写个清除定时，这样可以5秒后只跳一次
随时随地看视频慕课网APP
相关分类
JavaScript