JS8-6 取消计时器clearTimeout()中的start按钮
多次点击start按钮后,计时速度变快
多次点击start按钮后,计时速度变快
2016-08-24
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计时器</title>
</head>
<script type="text/javascript">
var num=0;
var i;
function startCount(){
document.getElementById('count').value=num;
num=num+1;
i=setTimeout("startCount()",1000);
}
i=setTimeout("startCount()",1000);
function stopCount(){
clearTimeout(i);
}
</script>
</head>
<body>
<form>
<input type="text" id="count" />
<input type="button" value="Start" onclick="i"/>
<input type="button" value="Stop" onclick="stopCount()"/>
</form>
</body>
</html>
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