JavaScript: Constructor and Object Oriented Programming

Constructor :

Grammar：

     object.constructor

Example：

Javascript code:

1   function obj1() {
2       this.number = 1;
3   }
4 
5   var x1 = new String("Computer");
6   
7   if (x1.constructor == String)
8       document.write("This object is a String.");
9  
10  var x2 = new obj1;
11 
12  if (x2.constructor == obj1)
13      document.write("This object constructor is obj1.");

The code will output:

This object is a String.

This object constructor is Obj1.


The influence of Object Oriented Programming:

we can konw what effect Constructor has.

It can show the type that a unkown object and check the type of object we build right or not.

It also the representative in Javascript of Object Oriented Programming.

So,we can say that :

In Javascript,Constructor is the source of Object Oriented Programming