Summary of JavaScript object knowledge

Today we talk about object-oriented, well, it’s not that object, it’s this object.

Let’s start today’s content:

What is object-oriented:

It is to put data and data operation methods together as an interdependent whole - object. Abstract the common features of similar objects to form a class.

Most data in this class can only be processed using the methods of this class. The class relates to the outside world through a simple external interface, and objects communicate through messages. The program flow is determined by the user during use.

Explanation of terms:

Based on objects: Everything is Objects are programmed with the concept of objects.

　Object-oriented programming:

　　Object: It is the thing that people want to study, not only It can represent concrete things as well as abstract rules, plans or events.

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　credBeGaya Object Attributes and behaviors：

Attributes: Use data values ​​to describe its state

Behavior: Methods used to change the behavior of an object

#:

The abstraction of an object with the same or similar properties is a class. The abstraction of objects is classes. The embodiment of tiredness is called an object.

After talking about object-oriented, let’s talk about process-oriented

:

Execute sequentially from top to bottom and seek refinement step by step; The program structure is divided into several basic modules according to functions, and these modules form a tree structure; the relationship between each module is as simple as possible and relatively independent in function;

　 Each module is internally composed of sequence It consists of three basic structures: , selection and loop;

The specific method of modular implementation is to use programs. The program flow is determined when the program is written.

After talking about so many conceptual issues, it is still a bit vague. Let’s write a method for related objects:

　1. Create an object

(1) Direct quantity

It is better to create a dog object, the code is as follows:

#　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　uce in in in on in on in on in on in in on in ons in

##

 dog ="Td""汪汪汪"

Let me talk about the difference between

constructor and factory pattern

:

The first letter of the constructor name is capitalized to distinguish it from the factory mode;

The this keyword is used inside the constructor;

Constructor There is no return value, the factory mode requires a return value;

That’s it for today, I will update it tomorrow. . . .

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