JS Prototype Object

What is a prototype object?

In JS, each created function has a prototype attribute, which points to an object, which is the prototype object

function

Results from the Chrome browser:

　　

What are prototype objects capable of?

First, when you call a function with new, an object instance is created and returned to this object

You can see that a is an object named Lla , with a __prototype__ attribute (described later), which can be thought of as empty; why is it empty? Because the inside of the constructor is empty;

How can we make it not empty?

　　

OK, Christina 18 of the handsome pot thick line up. Cough.

The This in the constructor is pointed to B in the new call, so B has two attributes, age,name;

Back to the question, what's the use of prototype objects?

　　

B is an instantiated object, and through the code above we find that B has not changed, but it can access the prototype object

The method, so. The role of the prototype object comes out, you can add a variety of shared properties for your instantiated objects and

method, these properties and methods are shared by all instances.

JS Prototype Object