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This article mainly explains "how to create objects with JavaScript". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to create objects with JavaScript".

Object: specifically refers to something in the natural world, with some characteristics (attributes) and behavior (methods), such as Yao Ming, the object has the characteristics of name, gender, height, ball number, team, etc., and can dribble, shoot, run, eat, etc., so how do we use js to create objects?

The first is to create instance objects literally.

Var YaoMing = {name: "YaoMing", age:36, gender: "male", eat:function () {console.log ('stinky tofu');}, read: () {console.log ('madman on the left and genius on the right');}}

The second kind: call the system constructor to create the object

Var per2=new Object (); per2.name= "Orojimaru"; per2.age=30; per2.sex= "male"; per2.eat=function () {console.log ("eating durian");}; per2.play=function () {console.log ("this little snake is really funny");}

At this point, check whether per2 is an instance of Object and return true.

The third: custom constructor to create objects

Function Person (name, age, gender) {this.name = name; this.age = age; this.gender = gender; this.play = function () {console.log ("playing games every day");};} var per = new Person ("maiden", 18, "female") Console.log (per instanceof Person); / / returns true

Now think about the third custom constructor to create an object. What is the internal implementation process?

Take the example above, creating an object var per = new Person ("Makita", 18, "female"); instantiating an object while also initializing the property age,name,gender assignment. The internal process is as follows:

* 1. Open up spatial storage objects

* 2. Set this as the current object

* 3. Set the values of properties and methods

* 4. Return the this object

Fourth: factory mode to create objects

/ / Factory mode creation object function createObject (name,age) {var obj=new Object (); obj.name=name; obj.age=age; obj.sayHi=function () {console.log (Hello);}; return obj;} / / Custom constructor creation object function Person (name,age) {this.name=name; this.age=age This.sayHi=function () {console.log ("Hello");};}

Factory mode creation object: var per1=createObject (Xiaoming, 20)

Custom constructor to create object: var per2=new Person (Xiao Hong, 20)

By comparing the above two ways of creating objects, we can draw the following conclusions:

Factory mode to create objects

1. Function name is lowercase, 2. The new keyword is used inside the function, 3. And there is a return value, the object after 4.new is the current object, 5. You can create an object by calling the function directly.

Custom constructor to create object

1. The initials of the function are capitalized, 2. The new keyword is not used inside the function, 3. There is no return value, 4.this represents the current object, 5. Create objects by means of new.

Thank you for reading, the above is the content of "how to create objects with JavaScript". After the study of this article, I believe you have a deeper understanding of how to create objects with JavaScript, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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