<!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;
function startCount() {
document.getElementById('count').value=num;
num=num+1;
setTimeout("startCount()",1000);
}
</script>
</head>
<body>
<form>
<input type="text" id="count"/>
<button onclick ="startCount()">Start</button>
</form>
</body>
</html>
2018-08-08
你这个代码没有错，就是button那里的属性问题，加多一个type=“button”就可以了，具体参考https://www.cnblogs.com/leona-d/p/6129018.html 跟input的button还是有一点区别的
<!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;
function startCount() {
document.getElementById('count').value=num;
num=num+1;
setTimeout("startCount()",1000);
}
</script>
</head>
<body>
<form>
<input type="text" id="count"/>
<!--
<input type="button" id="count1" value="Start" onclick="startCount()"/>
-->
<button type="button" onclick ="startCount()">Start</button>
</form>
</body>
</html>
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