javascript oop tutorial

and string types, and the result is false if the string cannot be converted to a numeric type. If it is possible to convert to a numeric type, the string is always first converted to the corresponding number and then compared, and only 1 is equal to true.Basic Type SummarySo we've covered the basic types of JavaScript, and we're going to use a piece of code and three graphs to summarize the content.var intvalue = 666;var Floatvalue = 3.14;var strvalu

namespace described here is equivalent to the concept of using the package in Java, which prevents the method name from conflicting and the code is as follows:[JavaScript]View Plaincopyprint? Name space var ajun = {}; Ajun. Examples = {}; Ajun. examples.user=function () { This.setname = function (newName) { name = NewName; }; This.getname = function () { return name; } This.getage = function () { return age; }; This

, and now we define a toString () method on the prototype of the person () constructor.function person () {this.name = ' keefool ';} Person.prototype.sayHello = function () {return ' Hello, I am ' + this.name;} Person.prototype.toString = function () {return ' [' + THIS.name + '] ';} function Employee (email) {this.email = email;} Employee.prototype = new Person (); Employee.prototype.constructor = Employee;var emp = new Employee ('[email protected]');Through the prototype chain and the hasOwnPr

elements of OOP:1. Encapsulation2. Inheritance3. Polymorphism 3. How does JavaScript implement OOP 3.1. encapsulation (WRAP) JavaScript Object encapsulation relies mainly on functions. The following is a simple example: //*********************************** * ********* // define pet) object //******************

The first thing to say is that JavaScript can actually be programmed for OOP, and then there are many ways to implement OOP programming in JavaScript, which I've written that I've tested and that is feasible.Version1//Parent ClassfunctionPerson (name) { This. Name =name} Person.prototype.say=Saymyname;functionSaymyname

Javascript OOP design Pattern Object-oriented programming When we first wrote the JS code, it was written like this. function CheckName () { //verify name } function Checkemail () { //verify mailbox } function Checkpassword () { //Verify password } This way can cause serious pollution of global variables, and then transition to var checkobject = { checknam

OOP, which is object-oriented programming. There is a flag in the traditional OOP language, which is the class, and the class can create many object instances that have the same properties and methods. For example, classes and objects in PHP can be described like this: php class person{ var $name ; // function Say () {// echo ' my Name: '. $this ->name; }} $person 1 = new person (

changes, you need to modify a considerable number of references to the parent class. This is not the best method. In actual application, you can use _ super to replace the parent class name, And _ this to replace your own name, and then replace them with [Super] in a standard way. prototype or [this]. prototype to call the specified method without ambiguity. This is the real solution of JavaScript oop. The

it's a PC, a smartphone, or a smart TV, all the devices that provide the JavaScript runtime can do something with JavaScript.Type overviewThe title reveals that this is another series of articles about JavaScript object-oriented programming.Before formally starting JavaScript object-oriented programming, we need to have a thorough understanding of the type of Ja

The OOP language gives us the ability to customize objects and variable types. Object Oriented Programming JavaScript is an object-oriented programming language (OOP). The OOP language gives us the ability to define our own objects and variable types. Objects have properties and methods. Property Property refers to

Objective Oop Oop-->>> inheritance/Closure in JavaScript Object-oriented 1.1 Object-oriented concepts 　　 Using one subclass to inherit another parent class, subclasses can automatically own the properties and methods of the parent class.>>> inherits the two parties, which occur between two classes. 1.2JS simulation Three ways to achieve inheritance

During the interview, you are always asked, what is your understanding of JavaScript object-oriented?Object-Oriented programming (Object-oriented Programming,oop) is a programming paradigm. It speaks of objects as the basic unit of program design, the program and data encapsulation to improve the reusability, flexibility and extensibility of the program. First, for exampleThere is a requirement: Do a verif

Today to share a JavaScript oop in the resolution of this point to the object of the small tricks, very practical yo!Let's look at a piece of code first:We can judge the Func (); and Obj.func (); Is this the two sentences?first of all, we all know that the point of this is the object that ultimately calls the function. But can you clearly judge the object of the function that is finally called? However, th

Some time ago, I made a topic about JavaScript and OOP in the team. I finally remember to bring it here and share it! 1. Data Structure The data in Javascript is concise. Simple data only includes undefined, null, Boolean, number, and string types, but there is only one type of complex data, that is, object. this is like the Chinese classical simple materialism,

JavaScript authoritative Guide To learn notes, Forbidden reprint!6. FunctionsFunction Call Method:Direct call: foo ();Method invocation as an object: Obj.method ();New:new Foo ();Call/apply/bind:func.call (obj);If there is no return statement in the function object or return is the base type, if there is this return value of this,(1) Creating a function~ function declaration: Functions foo (A, b) {...}~ Function Expression:1) var add= function (A, b)

JavaScript OOP Programming-three forms of implementing inheritance [1](1) The way of simulating the class, we all know that JS is a prototype inheritance mechanism, there is no class and instance separation of this wayLet's say we have two of classes.function Animal () {THIS.name = "Animal";This.eat = function () {Consle.log ("eating");}}function Cat () {This.say = function () {Console.log ("Miao miao!!");}

We know that in the OOP language you can explicitly inherit a class from another class, so that the class has the properties and methods of the parent class. In PHP, for example, we can inherit a class like this:classperson{//Parent Class var $name; functionsay () {Echo"My Name:".$this-name; } }classTeacherextendsperson{//sub-class var $job; functionteach () {Echo"My Name:".$this->name. " My profession: ".$this->job;//$this->name inherit from par

is an array of classes, by determining the length of the passed parameter can be accessed to the value of the parameter list. Polymorphic definition: means that objects of different classes are allowed to respond to the same message. That is, the same message can be used in a variety of different ways depending on the sending object. The white point is that a parent class is inherited by multiple subclasses, and then multiple subclasses can add their different properties and methods. functio

Object What is an object 　　　　All things in JavaScript are objects: strings, numbers, arrays, functions ... In addition, JavaScript allows custom objects to be customized.In a word, everything is an object in JavaScript. How to create an object Use {} to create an object var user = { ' name ': ' Jay Chou ',