JS Factory Model Brief Introduction

What is a factory model? It's like a factory that can build cars, airplanes ..., by the external interface, by the customer to decide, to customize which product.

In JS, as a factory function/object, including cars, airplanes and other sub-classes, provide external interface, according to the parameters to return the instances of different subclasses

A simple example is as follows:

varfactory={car:function(name, size) { This. name=name;  This. size=size;  This. getname=function(){            return  This. Name}}, plane:function(name, size) { This. name=name;  This. size=size;  This. getname=function(){            return  This. Name}}, Makecar:function(name, size) {return New  This. Car (name, size)}, Makeplane:function(name, size) {return New  This. Plane (name, size)}, make:function(type, name, size) {return New  This[Type] (name, size)}}varo= factory.make (' Plane ', ' Boeing ', 1000) Console.log (O.getname ())

When to use:

1. Object building is complex

2. Need to rely on a specific environment to create different instances

3. Handling large numbers of small objects with the same attributes

Advantages:

Eliminate coupling between objects, place all instantiated code in one place to avoid code duplication

Disadvantages:

Most classes are best used with the new keyword and constructor to make the code easier and easier to read. Without having to look at the factory method to know

JS Factory Model Brief Introduction