JavaScript Intermediate Notes Chapter 5 The Basics of Object Orientation

JavaScript Intermediate Notes Chapter 5 The Basics of Object Orientation_Javascript Skills

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Release： 2016-05-16 18:46:30

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1. The basis of object-oriented
Objects are the basis of JavaScript. At the most basic level, an object is a collection of properties.
1, Creation of objects

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I believe many friends are interested in these creations I have been exposed to the object's method many times, and I am very familiar with it. 2. Use of objects

Unlike other object-oriented languages, JavaScript does not have the concept of classes. In JavaScript, any function can be instantiated as an object.

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This code passes new User () to create a new object of the function. The new object created has a name attribute, and the constructor attribute points to the function that created it.
3. Public methods

Public methods are always accessible to users in the context of the object. To implement this method, you need to use the prototype attribute-prototype.

The prototype of an object is still an object. After adding properties to a prototype object, every object instantiated by the prototype can access these properties, that is, these properties are public.

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4, private Method

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5, privileges Method It accesses private variables in a public way.

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]Essentially, the privileged method is Dynamically generated. Because they are added to the object at runtime, not generated when the code is first compiled.
This ability to dynamically generate code cannot be underestimated. It is very useful to be able to generate code based on the time variables you want. Look at the following example of dynamic generation method:

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6, static Methods
The essence of static methods is no different from ordinary functions. Static methods can ensure the cleanliness of the object's namespace.

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2. Summary
It is very important to understand the concepts and content described in this chapter. This is the starting point for fully mastering professional JavaScript.