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Introduction to factories in JavaScript design patterns

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Jul 03, 2018 pm 02:52 PM

javascriptFactory patternDesign Patterns

This article mainly introduces the factory pattern of JavaScript design patterns. It analyzes the concept and principle of the factory pattern in the form of complete examples, as well as the definition of javascript and the related operating skills of using the factory pattern. Friends in need can refer to it

The examples in this article describe the factory pattern of JavaScript design patterns. Share it with everyone for your reference, as follows:

1. Factory pattern concept

The factory pattern defines an interface for creating objects. This interface determines which class to instantiate by the subclass. This pattern defers instantiation of a class to subclasses. Subclasses can override interface methods to specify their own object types (abstract factory) when creating.

This mode is very useful, especially when assigning values to the process of creating objects, such as relying on many settings files. Moreover, you will often see factory methods in programs, which are used to let subclasses define the types of objects that need to be created.

2. The functions and precautions of the factory mode

The functions of the mode:

1. The object construction is very complex-it is very simple for us to put on shoes, but the process of making shoes is very Complex

2. Different instances need to be created depending on the specific environment - the factory can make shoes and clothes, the factory can make the shoes I need (the shoes are different), and then send them to the designated place (the places can be different) ), can be understood as different instances

3. Processing a large number of small objects with the same attributes--such as buying a pair of shoes, there is no need to find a factory to produce

Notes:

1. Don’t abuse the factory. Sometimes it just adds complexity to the code - as above 3

3. Factory pattern code and practical summary

<!DOCTYPE html>
<html>
<head lang="en">
 <meta charset="UTF-8">
 <title>工厂模式</title>
</head>
<body>
<script>
 //1.工厂应该有厂长来决定运行到底哪条产品线
 //2.消费者-》子类
 var gongchang = {};
 gongchang.chanyifu = function(){
  this.gongren = 50;
  console.log("我们有"+this.gongren);
 }
 gongchang.chanxie = function(){
  this.gongren = 100;
  console.log("产鞋子");
 }
 gongchang.yunshu = function(){
  this.gongren = 10;
  console.log("运输");
 }
 gongchang.changzhang = function(para){
  return new gongchang[para]();
 }
 var we = gongchang.changzhang("chanyifu");
 var me = gongchang.changzhang("chanxie");
 console.log(me.gongren);
 var ys = gongchang.changzhang("yunshu");
 console.log(ys.gongren);
</script>
</body>
</html>

The operation effect is as follows:

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