<html>
<head>
<metacharset="utf-8">
<title>JS定时器</title>
<styletype="text/css">
#btn1:hover,#btn2:hover{
background:red;
}
</style>
</head>
<body>
<inputtype="button"id="btn1"value="开启"/>
<inputtype="button"id="btn2"value="关闭"/>
<script>
varobtn1=document.getElementById('btn1');
varobtn2=document.getElementById('btn2');
vartimer=null;
obtn1.onclick=function(){
timer=setB
clearInterval(timer);//关闭循环
}
</script>
</body>
</html>
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