Attributes are the most important part of objects in JavaScript

This article mainly introduces the JavaScript attribute is the most important part of the object, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

Properties are the most important part of any JavaScript object

Property refers to the value associated with the JavaScript object.

A JavaScript object is a collection of unordered attributes.

Properties can usually be modified, added, and deleted, but some properties are read-only.

Access the JavaScript property

The syntax for accessing object properties is:

ObjectName.property / / person.age

Or:

ObjectName ["property"] / / person ["age"]

Or:

ObjectName [expression] / / x = "age"; person [x]

The expression must evaluate to the property name.

Example 1

Person.firstname + "is" + person.age + "years old."

Example 2

Person ["firstname"] + "is" + person ["age"] + "years old."

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