可以通过两种方式访问对象属性。一个是.property，另一个是[property]。
Object.property;Object["property"];为了更好地理解，让我们看下面的示例。
在下面的示例中，定义了一个名为“ person”的对象，并以点符号访问其属性。
<html>
<body>
<script>
var person = {
firstname:"Ram",
lastname:"kumar",
age:50,
designation:"content developer"
};
document.write(person.firstname + " " + "is in a role of" + " " + person.designation);
</script>
</body>
</html>输出结果
Ram is in a role of content developer在下面的示例中，对象“人”的属性以 括号表示法访问。
<html>
<body>
<script>
var person = {
firstname:"Ram",
lastname:"kumar",
age:50,
designation:"content developer"
};
document.write(person['firstname']+ " " + "is in a role of" + " " + person['designation']);
</script>
</body>
</html>输出结果
Ram is in a role of content developer