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Vue in-depth learning - vuex principles
2021-08-27 00:14:46 【Chief】
1、Vuex What is it? ?
Applicable scenario : Component data transfer for complex relationships
Vuex
It acts as a container for storing shared variables
state
A place to store shared variablesgetter
, You can add onegetter
Derived state ,( amount tostore
Calculation properties in ), To get the value of a shared variablemutations
Used to store changesstate
Methods .actions
It's also used to store changes state Methods , howeveraction
Is inmutations
Based on . It is often used to do some asynchronous operations
2、Store The instantiation process
State
Provides a unique public data source , All the shared data should be put intoStore
OfState
For storage .
// establish `store` data source , Provide unique public data
const store = new Vuex.Store({
// state Point to an object , The data in the object is the data that needs to be shared globally
state: { count:0 }
})
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- Component access
State
Two ways of data in :
// The first one is
$store.state.count( Global data name )
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// The second kind , from vuex On demand import mapState function
import { mapState } from 'vuex'
// Put the global data , Mapping to the calculated properties of the current component
computed: {
...mapState(['count'])
}
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3、 What is a single data stream ?
Data triggers changes to the view , Views interact with users , Modify after triggering the action
data
data , The entire circular data flow is called a single data flow . amount to ( The process of passing a parent component into a child component )
new Vue({
// state Data sources that drive applications ;
data () {
return {
count: 0
}
},
// view To declare state Map to view ;
template: `
<div>{{ count }}</div>
`,
// actions Response in view State changes caused by user input on .
methods: {
increment () {
this.count++
}
}
})
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4、 What is? Mutation?
① change Vuex Of
store
The only way to get a state in ;② Only through
mutation
changeStore
data , Do not operate directlyStore
Data in ;
// Definition Mutation
const store = new Vuex.Store({
state: {
count:0
},
mutations: {
addN(state, step){
// Change status
state.count += step
}
}
})
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// Trigger mutation
methods: {
handle(){
// Trigger mutations The first way
// this.$store.commit('add')
// call commit function , Trigger mutations Parameters are carried when
this.$store.commit('addN', 3)
}
}
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summary :
store
It's a data warehouse , In order to manage the warehouse more conveniently , Take a big one store Break it up into small onesmodules
;Whole
moudles
It's a tree structure , Everymodule
They definestate
,getters
,mutations
,actions
;Facilitate the module by recursion , Completed their initialization .
Vuex
Provide these API It's all convenient, rightstore
Do various operations to complete various abilities , In especialmapXXX
The design of the .
copyright notice
author[Chief],Please bring the original link to reprint, thank you.
https://en.qdmana.com/2021/08/20210827001443284k.html
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