[03--DOM] 循环弹框
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
function f() {
alert("你看到我了?")
}
// 循环弹框setInterval
var t=setInterval(f,3000)
// clearInterval(t) 循环
</script>
</head>
<body>
</body>
</html>