JavaScript Object-oriented

Last Update:2017-01-24 Source: Internet

Author: User

Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Object-oriented: without understanding the principle of the case, will use the function, do not pay attention to internal details, is a general idea

Object: Black box does not understand the internal structure, know the surface of the various operations

Object-oriented Programming OOP:

Features: Abstraction (grasping core issues),
Encapsulation (regardless of internal implementation, only features are considered),
Inheritance (genetic parents and children inherit some properties and methods from the parent class, and can have their own new method)

Multiple inheritance polymorphism

Objects are made up of properties and methods

Properties-Variables: state static

Method-Function: Process dynamics

<!DOCTYPE HTML><HTML><HeadLang= "en">    <MetaCharSet= "UTF-8">    <title></title></Head><Body><Scripttype= "Text/javascript">    vara=7;//the variable is free, not belong to anyonealert (a); vararr=[1,2,3,4,5,6]; ARR.A= A;//property is not free and belongs to an objectalert (ARR.A); functionAA () {alert ('ABC');//function: Free} AA (); Arr.aa= function() {alert ('ABCD');//method: Non-free belongs to the object} arr.aa ();</Script></Body></HTML>

Results: 7 ABC ABCD

This: The current method of the object in which the event occurred.

<Scripttype= "Text/javascript">    vararr=[1,2,3,4]; ARR.A= A; Arr.show=function() {alert ( This. a); } arr.show ();</Script>

<type= "Text/javascript">    window.show=  function() {    alert (this);    }    Show (); </ Script >

Object window The current method belongs to who belongs to window

You can no longer add methods or properties to the system object, otherwise overwrite existing methods and properties
Object objects have no things

<Scripttype= "Text/javascript">   varobj=NewObject (); Obj.name='Blue'; OBJ.QQ='930260035'; Obj.showname= function() {alert ('My name is:'+ This. Name); } obj.showqq= function() {alert ('my QQ is:'+ This. QQ);    } obj.showname (); OBJ.SHOWQQ ();</Script>

<Scripttype= "Text/javascript">    functionCreateperson (name,qq) {//constructor Function       //Raw Materials        varobj=NewObject (); //processingObj.name=name; OBJ.QQ=QQ; Obj.showname= function() {alert ('My name is:'+ This. Name);        }; OBJ.SHOWQQ= function() {alert ('my QQ is:'+ This. QQ);        }; //Factory        returnobj; }    varobj=Createperson ('Blue','54546466');    Obj.showname ();    OBJ.SHOWQQ (); varObj2=Createperson ('Zhang San','555555555');    Obj2.showname (); OBJ2.SHOWQQ ();</Script>

Disadvantages of the factory approach: no new function duplication leads to wasted resources

JavaScript Object-oriented

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

Sales Support

1 on 1 presale consultation

Chat Contact Sales
After-Sales Support

24/7 Technical Support 6 Free Tickets per Quarter Faster Response

Open a Ticket
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

Learn More

JavaScript Object-oriented

Contact Us

A Free Trial That Lets You Build Big!

Sales Support

After-Sales Support