javascript inheritance example

unnecessary attributes. At the same time, the prototype chain can remain unchanged, so instanceof and isPrototypeof () can be used normally (). This is also the most ideal inheritance method currently, and is also transforming to this mode. (YUI also uses this mode .) This blog reference JavaScript advanced programming version 3rd, the code is rewritten, more specific, and added annotations to make everyon

Object-oriented language must support the Inheritance Mechanism. One class can reuse the methods and attributes of another class. 1. Inheritance Method Object impersonating Working principle: the constructor uses the this keyword to assign values to all attributes and Methods. Because the constructor value is only a function, the classa constructor can be used as a classb method. Then, the classb receive

Javascrip: a small example of inheritance. For more information, see The Code is as follows: // InheritFunction Person (name, sex){This. name = name;This. sex = sex;}Person. prototype. sayName = function (){Alert (this. name );}Person. prototype. saySex = function (){Alert (this. sex );}Function Worker (name, sex, job){// Inherit the person classPerson. call (this, name, sex) // here this refers to the

inheritance is that it only calls the parent Type constructor once, avoiding unnecessary or unnecessary attributes. At the same time, the prototype chain can remain unchanged, so instanceof and isPrototypeof () can be used normally (). This is also the most ideal inheritance method currently, and is also transforming to this mode. (YUI also uses this mode .) This blog reference

Agreed to explain the JavaScript inheritance, but delayed to now explain. No more nonsense, go straight to the point. Since you want to understand the inheritance, prove that you have a certain understanding of JavaScript-oriented objects, such as what you do not understand can refer to the object-oriented JS Basic ex

.getsuerpervalue ()); Truealert (instance1.test); H1,H2,H3,H4,H5 alert (Instance1.getsubvalue ()); False alert (Instance1.color); Pink,yellow,bluevar Instance2 = new Subtype (' WYC '); Instance2.testfun (); Http://www.cnblogs.com/wuyuchang/alert (Instance2.name); WYC alert (Instance2.getsuerpervalue ()); Truealert (instance2.test); H1,h2,h3,h4alert (Instance

());//truealert (instance2.test);//H1,h2,h3,h4Alert (Instance2.getsubvalue ());//falsealert (Instance2.color);//Pink,yellowThe above code passes through Supertype.call (this, name), inherits the properties of the parent type, through Subtype.prototype = new Supertype (), and inherits the method of the parent type. The above code is very convenient to solve the prototype chain and borrowing the problems encountered by the constructor, JavaScript is th

One- phase object inheritance mechanismToday is nothing to do, to understand the three major characteristics of object-oriented inheritance, the past learning C + + and C # are Orthodox object-oriented languageWords, the study time also did not have much in-depth understanding, just simple study the most basic inheritance. In the afternoon when looking at the

JavaScript inheritance (1) and javascript inheritanceObject-oriented and Object-based Almost every developer has development experience in object-oriented languages (such as C ++, C #, and Java. In traditional object-oriented languages, there are two very important concepts: classes and instances. Class defines the common behaviors and methods of a class of thing

(including constructor, _ proto _ and other attributes), so no content is listed. For example: var num=0；　　for(var propertyName in null)　　{　　num++;　　} Alert (num); // The displayed value is 0. The most important thing is that null has no prototype. It is not instantiated from the Object () constructor (or its subclass). If you perform the instanceof operation on it, false is returned. 2. "Empty object" "Null Object" refers to a standard Object instan

() { this.showSub = function(a,b) { alert(a-b); } } function Class11() { this.showAdd = function(a,b) { alert(a+b); } } function Class2() { Class10.call(this); Class11.call(this); } It's easy to implement multi-inheritance with two calls. Of course, there are other methods to inherit js, such as using prototype chain. This does not belong to the scope of this article, but only describes the usage of call here. When we talk about call and apply, the tw

Rough exploration of the JavaScript inheritance mode and javascript inheritance In the real sense, Javascript is not an object-oriented language and does not provide traditional inheritance methods, but it provides a prototype

JavaScript inheritance (4) and javascript inheritance In this chapter, we will analyze Douglas Crockford's implementation of JavaScript Inheritance-Classical Inheritance in JavaScript.C

Understanding javascript Object Inheritance, and javascript Object Inheritance First, I will study it from a question. What is javascript Object Inheritance? For example, we have a cons

Let's talk about javascript prototype inheritance and javascript prototype inheritance. In the real sense, Javascript is not an object-oriented language and does not provide traditional inheritance methods, but it provides a proto

Comparison of several inheritance methods in Javascript and several inheritance methods in javascriptOpening In the 'strict' sense, javascript is not a real object-oriented language. The reason for this is that javascript, as a weak language, is very different from the

JavaScript is a prototype-based object-oriented language. That is to say, each instance object has a prototype. The object inherits attributes and methods from the prototype. This article describes the inheritance of constructor. Speaking of the basic mechanism of JavaScript prototype inheritance, this article details

JavaScript implements Multi-Inheritance Method Analysis and javascript inheritance This example describes how to implement multiple inheritance in JavaScript. We will share this with yo

JavaScript inheritance (3) and javascript inheritance In chapter 1, we use constructors and prototypes to implement classes and inheritance in the JavaScript world, but there are many problems. In this chapter, we will analyze the

Inheritance features in javascript and javascript inheritance features Object-Oriented Programming Language Classification Prototype inheritance is completed dynamically, and the method added to the prototype takes effect immediately. Even if the object instance al