学员操作——创建继承person的student子类
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>创建继承person的student子类</title>
</head>
<body>
<p>姓名:<span ).innerHTML=student1.showAge();
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>创建继承person的student子类</title>
</head>
<body>
<p>姓名:<span ).innerHTML=student1.showAge();
</script>
</body>
</html>