javascript constructor function

by default when we use the JS system or the object we create. any object has a constructor property, inherits from the prototype, andconstructor points to the constructor or constructor that constructs the object. Constructor can be rewritten, so use caution. By default, all prototype objects automatically contain a

Perhaps many beginners in C + + know what a constructor is, but they are unfamiliar with the copy constructor (copy constructor). For me, there's not much chance of using a copy constructor when writing code, but that doesn't mean that the copy constructor is useless, but th

We all say that JavaScript properties are many, can not remember, various structures are difficult to understand. Indeed JS is a quick way to improve the difficult language, but there are other ways to assist the memory. The following is to discuss the JS of a major difficulty-object layout, exactly how the person who designed JS this language was how to do? What did you become when you finished the design?Let's look at a picture:I believe you are not

efficient and less likely to make mistakes. Here we use an example to explain: The first approach is to assign values to the data members of the subclass object in the constructor of the subclass. Code 1: #include #include using namespace Std; Class Father { Public Father () { cout } ~father () { cout } void print () { cout } Protected String name; int height; }; Class Son:public Father { Public Son (String A,int i,int J)//The first argument assign

Function Definition A function is declared in this way: the keyword function, function name, a set of parameters, and the code to be executed in parentheses. There are three types of function constructor Syntax: Js Code The Code i

A good explanation of JavaScript inheritance, but slow to explain now. Don't say much nonsense, go straight to the chase.Since you want to understand the inheritance, prove that you have a certain understanding of JavaScript object-oriented, such as what is not understood can refer to the "Object-oriented JS basic explanation, Factory mode, constructor mode, prot

example:Copy codeCode: foo (){(=== Window ){Console. log ();}}Foo. boo = (){(=== Foo ){Console. log ();} (=== Window ){Console. log ();}};Foo ();Foo. boo ();Foo. boo. apply (window ); Prototype Prototype is essentially a JavaScript Object. Each function has a default prototype attribute.If this function is used to create a custom object, we call it a

represented by class, but by function, this type of information itself is an object. It is difficult to understand the definition of types and objects in Java, For example, Javascript defines a Function-type object as follows: function Cat(){ return 1;}; In this Code, Cat plays two roles: Custom Cat, object Cat,

(separate understanding will be more clear).In short, I think (in my JavaScript position for a few days) that Foo.prototype is the __proto__ "Dad" or "true" of the new instance, and foo.__proto__ is the "shadow" or "View" of the class. (special), when the father changed the son of course different, but the son change is the father will also change (I can only understand, I really don't know). And constructor