計(jì)數(shù)會(huì)跳數(shù)字
<title>計(jì)時(shí)器</title>
<script type="text/javascript">
? var num=0;
? function startCount() {
??? document.getElementById('count').value=num;
??? num ++;
??? setTimeout(startCount,1000);
? }
? var count = setInterval(startCount,1000);
</script>
</head>
<body>
<form>
<input type="text" id="count" onclick = "startCount"/>
為甚么不是從0，1，2，3，這樣計(jì)數(shù)，而是0，2，5，9這樣計(jì)的，求指點(diǎn)
2019-04-09
第14行寫這句：?window.onload=startCount;
2019-01-27
<title>計(jì)時(shí)器</title> <script?type="text/javascript"> ??var?num=0; ??function?startCount()?{ ????document.getElementById('count').value=num; ????num?++; ????setTimeout("startCount()",1000);//修改處 ??} ??var?count?=?setTimeout("startCount()",1000);//修改處 </script> </head> <body> <form> <input?type="text"?id="count"?onclick?=?"startCount"/>2019-01-25
樓上回答應(yīng)該沒實(shí)踐過，看下我的代碼，我認(rèn)為應(yīng)該是onclick = "startCount"，的問題，你可以自己再嘗試下。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script type="text/javascript">
var num=0;
function startCount() {
document.getElementById('count').value=num;
num ++;
// ? setTimeout(startCount,1000);
setTimeout("startCount()",1000);
}
var count = setInterval(startCount,1000);
</script>
</head>
<body>
<input type="text" id="count" onclick="startCount()"/>
</body>
</html>
2019-01-17
startCount()函數(shù)里面用了setTimeout，外面就不要再用setInterval，本來就無限循環(huán)計(jì)數(shù)了，你還要每隔一秒再運(yùn)行一個(gè)無限循環(huán)計(jì)數(shù)，當(dāng)然會(huì)跳，不但會(huì)跳，時(shí)間一長瀏覽器還會(huì)崩潰