创建对象的实例
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>滴答编程(dida100.com)</title>
</head>
<body>
<script>
person={firstname:"John",lastname:"Doe",age:50,eyecolor:"blue"}
document.write(person.firstname + " is " + person.age + " years old.");
</script>
</body>
</html>