Application of IOC technology in front end project

itread01 2021-01-23 23:26:07
application ioc technology end project

[TOC]## Background the development of the front end has passed 30 Over the years , Front end applications are growing , And it's getting more and more complicated , As the number of lines of code and project requirements increase , Dependencies between internal modules may also become more and more complex , Between modules ** Low reusability ** Lead to application ** Difficult to maintain **, However, we can solve these problems to some extent with the help of some excellent programming concepts in the computer field , What we're going to talk about next is `IoC` Is one of them .## What is IOC Actually, I learned java I'm sure I'll know java There is a very famous framework called **springboot**, It's going to be AOP and IOC And other concepts are applied to the ultimate masterpiece , So specific IOC What is it for , Let's take a look at the next paragraph .`IoC` The full name of is called `Inversion of Control`, It can be translated as 「** Inversion of control **」 or 「** Dependency inversion **」, It mainly contains three principles :1. High level modules should not rely on low-level modules , They should all depend on abstraction 2. Abstraction should not depend on concrete implementation , Concrete implementation should rely on abstraction 3. ** Interface oriented programming ** Instead of implementation oriented programming, suppose we have a class `Human`, Let's take an example `Human`, We need a class `Clothes`. And example clothes `Clothes`, We also need the example of the cloth `Cloth`, Example button and so on . When the demand reaches a certain degree of complexity , We can't start from cloth and button to get dressed for one person , It's better to put all the requirements in a factory or warehouse , What do we need to take directly from the warehouse of the factory . This is when dependency injection is needed , We achieve one IOC Containers ( Warehouse ), Then, if you need clothes, you can directly take the items of good clothes from the warehouse for people to wear as attributes . This greatly reduces the cost of our coding .## How to implement a IOC In fact, realize IOC The idea is simple , Or it's a very light thing , Anyone who knows the principle can realize it . First, let's repeat what we just described ioc The concept of , Under normal circumstances, we need Human,Clothes Class can only be created one by one .```jsexport class Human {}export class Clothes {}function test() { const human = new Human(); const clothes = new Clothes();}``` It's not hard to see that when a small number of objects need to be created, it's really no problem to do so , But if there are hundreds or thousands of objects in a huge system , In different business scenarios, we need load Different objects , At the same time, we also need to control the destruction of objects to avoid GC. So we have to do a lot of work to deal with the front-end objects , This leads us to the next work we need to do, how to manage objects . ### First step : Implementing a container is actually a big concept , In fact, it's simply a Map Things like that , Used to store existing items . Here's a small one I've implemented demo, It is mainly the container class for storage . To make sure the container is unique , So I designed it as a singleton pattern .```tsxexport class SimpleContainer { private containerMap =

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