<!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 clock(){
var time=new Date();
document.getElementById("clock").value = time;
}
var i = setInterval("clock()",1000);
function clear(){
clearInterval(i);
}
</script>
</head>
<body>
<form>
<input type="text" id="clock" size="50" />
<input type="button" value="Stop" onclick="clear()" />
</form>
</body>
</html>
你为什么还要把clearInterval(i);放到函数中去呢,不可以onclick直接出发吗?
找到原因了,clear是js的内置函数,把函数命名为clear函数不会执行