求setTimeout与setInterval 的区别
<!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 i;
function aclock(){
var time=new Date();
document.getElementById("clock").value = time;
i=setInterval("aclock()",1000);
}
function stopclock(){
clearInterval(i);
}
</script>
</head>
<body>
<form>
<input type="text" id="clock" size="50" />
<input type="button" value="Begin" onclick="aclock()"/>
<input type="button" value="Stop" onclick="stopclock()" />
</form>
</body>
</html>
为什么这个代码实现后无法停下来？
