<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计时器</title>
<script type="text/javascript">
function add() {
var time = new Date();
document.getElementById("clock").value = time;
var i = setTimeout(add, 1000)
}
var l = setTimeout(add, 100)
</script>
</head>
<body>
<form>
<input type="text" id="clock" size="50" width="20" />
<input type="button" value="Stop" onclick="clearTimeout(i)" />
</body>
</html>代码这样
3 回答
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qq_青枣工作室_0
TA贡献446条经验 获得超754个赞
因为你的i变量没放到全局变量上。把
var i = setTimeout(add, 1000) 前面的var去掉。
再在function add() {}外面定义一个
var i;
function add() {
var time = new Date();
document.getElementById("clock").value = time;
i = setTimeout(add, 1000)
}
var i;
woshiajuana
TA贡献211条经验 获得超152个赞
你写错了
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计时器</title>
<script type="text/javascript">
function add() {
var time = new Date();
document.getElementById("clock").value = time;
l = setTimeout(add, 1000)
}
var l = setTimeout(add, 100)
</script>
</head>
<body>
<form>
<input type="text" id="clock" size="50" width="20" />
<input type="button" value="Stop" onclick="clearTimeout(l);"/>
</form>
</body>
</html>
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