JavaScript倒计时
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>倒计时</title>
</head>
<body>
<div ,1000);
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>倒计时</title>
</head>
<body>
<div ,1000);
</script>
</body>
</html>