No.8 Vue element admin learning (III) vuex learning and login method analysis

dangsh 2021-08-08 18:39:27
no.8 vue element admin learning


This is my participation 8 The fourth of the yuegengwen challenge 8 God , Check out the activity details :8 Yuegengwen challenge

Because saving login status takes vuex, I haven't learned systematically before vuex, Learn first vuex Well .

vuex be called State management mode The status of the storage components in the set , My understanding is to store data .

Vuex The core of the application is store( Warehouse )

Vuex There are two differences between a global object and a global object

  1. Vuex The state store of is responsive
  2. Can't change directly store The state of . change store The only way to do this is to explicitly commit (commit) mutation

Next is vuex Some of the core concepts of

  1. State from store The easiest way to read a state in an instance is to return a state in a calculated property
computed: {
count () {
return this.$store.state.count
}
}
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When there are many attributes , It's complicated to calculate properties , It can be used mapState Auxiliary functions help us to generate calculated properties

computed: mapState({
// The arrow function makes the code simpler
count: state => state.count,
// Pass string parameters 'count' Equate to `state => state.count`
countAlias: 'count',
// In order to be able to use `this` Get local state , You have to use regular functions
countPlusLocalState (state) {
return state.count + this.localCount
}
})
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2.Getters, Understood as a store Calculated attributes of

getters: {
doneTodos: state => {
return state.todos.filter(todo => todo.done)
}
}
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Use mapGetters You can put store Medium getter Map to local calculated properties

computed: {
...mapGetters([
'doneTodosCount',
'anotherGetter',
// ...
])
}
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You can also give getter Property rename

...mapGetters({
doneCount: 'doneTodosCount'
})
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  1. mutation
mutations: {
increment (state) {
state.count++
}
}
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Can't call directly mutations, Need to use

store.commit('increment')
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store.commit Additional parameters can be passed , Parameters can also be objects , Object can contain multiple fields .

mutations: {
increment (state, n) {
state.count += n
}
}
store.commit('increment', 10)
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mutation It's all synchronous transactions

  1. Action

Action Be similar to mutation, But it can include asynchronous operations .

actions: {
increment (context) {
context.commit('increment')
}
}
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have access to ES2015 Parameter deconstruction processing

actions: {
increment ({ commit }) {
commit('increment')
}
}
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Action Can pass store.dispatch Methods the trigger ,emm Action It looks a little more complicated , Let's see it in actual combat , Basically, it performs some asynchronous requests and other operations .

  1. Modules When the application is complex , Prevent one store Too big , Segmentation performed

Each module has its own state、mutation、action、getter. Definition moduleA,moduleB, And then in store Register these two module, You can call

const moduleA = {
state: () => ({ ... }),
mutations: { ... },
actions: { ... },
getters: { ... }
}
const moduleB = {
state: () => ({ ... }),
mutations: { ... },
actions: { ... }
}
const store = new Vuex.Store({
modules: {
a: moduleA,
b: moduleB
}
})
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store.state.a // -> moduleA The state of
store.state.b ```
// -> moduleB The state of
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Other details will be analyzed later , go back to vue-element-admin On the code .

this.$store.dispatch('user/login', this.loginForm)
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Obviously , Call a user/login Of action, The official course will not deceive me

image.png

login action In the call login Method login ,then Inside, put the returned token out ,commit To mutation in , And call setToken There is cookies in , Asynchronous return

this.$router.push({ path: this.redirect || '/', query: this.otherQuery })
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Jump to the root directory , Login is now complete ,token,cookies Storage complete , Yes vuex I also have a general understanding of how to use .

版权声明
本文为[dangsh]所创,转载请带上原文链接,感谢
https://qdmana.com/2021/08/20210808183744906w.html

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