标签：back style int tac cad php 差值 mamicode 接收
Vuex 允许我们将 store 分割成模块（module）。
每个模块拥有自己的 state、mutation、action、getter、
甚至是嵌套子模块——从上至下进行同样方式的分割：
const moduleA = {
state: { ... },
mutations: { ... },
actions: { ... },
getters: { ... }
}
const moduleB = {
state: { ... },
mutations: { ... },
actions: { ... }
}
const store = new Vuex.Store({
modules: {
a: moduleA,
b: moduleB
}
})
store.state.a // -> moduleA 的状态
store.state.b // -> moduleB 的状态对于模块内部的 mutation 和 getter，接收的第一个参数是模块的局部状态对象。
const moduleA = {
state: { count: 0 },
mutations: {
increment (state) {
// 这里的 `state` 对象是模块的局部状态
state.count++
}
},
getters: {
doubleCount (state) {
return state.count * 2
}
}
}同样，对于模块内部的 action，局部状态通过 context.state 暴露出来，根节点状态则为 context.rootState：
const moduleA = {
// ...
actions: {
incrementIfOddOnRootSum ({ state, commit, rootState }) {
if ((state.count + rootState.count) % 2 === 1) {
commit(‘increment‘)
}
}
}
}对于模块内部的 getter，根节点状态会作为第三个参数暴露出来：
const moduleA = {
// ...
getters: {
sumWithRootCount (state, getters, rootState) {
return state.count + rootState.count
}
}
}默认情况下 注册在全局命名空间的 这样使得多个模块能够对同一 mutation 或 action 作出响应。
可以通过添加 namespaced: true 的方式使其成为带命名空间的模块。
将 { root: true } 作为第三参数传给 dispatch 或 commit 即可
dispatch(‘someOtherAction‘) // -> ‘foo/someOtherAction‘
dispatch(‘someOtherAction‘, null, { root: true }) // -> ‘someOtherAction‘
commit(‘someMutation‘) // -> ‘foo/someMutation‘
commit(‘someMutation‘, null, { root: true }) // -> ‘someMutation‘若需要在带命名空间的模块注册全局 action，你可添加 root: true，并将这个 action 的定义放在函数 handler 中。例如：
{
actions: {
someOtherAction ({dispatch}) {
dispatch(‘someAction‘)
}
},
modules: {
foo: {
namespaced: true,
actions: {
someAction: {
root: true,
handler (namespacedContext, payload) { ... } // -> ‘someAction‘
}
}
}
}
}computed: {
...mapState({
a: state => state.some.nested.module.a,
b: state => state.some.nested.module.b
})
},
methods: {
...mapActions([
‘some/nested/module/foo‘, // -> this[‘some/nested/module/foo‘]()
‘some/nested/module/bar‘ // -> this[‘some/nested/module/bar‘]()
])
}上面的例子可以简化为【如果有的方法在全局里，有的在模块中，则使用上面未简化版本】
computed: { ...mapState(‘some/nested/module‘, { a: state => state.a, b: state => state.b }) }, methods: { ...mapActions(‘some/nested/module‘, [ ‘foo‘, // -> this.foo() ‘bar‘ // -> this.bar() ]) }可以通过使用
createNamespacedHelpers创建基于某个命名空间辅助函数import { createNamespacedHelpers } from ‘vuex‘ const { mapState, mapActions } = createNamespacedHelpers(‘some/nested/module‘) export default { computed: { // 在 `some/nested/module` 中查找 ...mapState({ a: state => state.a, b: state => state.b }) }, methods: { // 在 `some/nested/module` 中查找 ...mapActions([ ‘foo‘, ‘bar‘ ]) } }
在 store 创建之后，你可以使用 store.registerModule 方法注册模块：
import Vuex from ‘vuex‘
const store = new Vuex.Store({ /* 选项 */ })
// 注册模块 `myModule`
store.registerModule(‘myModule‘, {
// ...
})
// 注册嵌套模块 `nested/myModule`
store.registerModule([‘nested‘, ‘myModule‘], {
// ...
})当你设置
preserveState: true时，该模块会被注册，action、mutation 和 getter 会被添加到 store 中，但是 state 不会。这里假设 store 的 state 已经包含了这个 module 的 state 并且你不希望将其覆写。
如果我们使用一个纯对象来声明模块的状态，那么这个状态对象会通过引用被共享，导致状态对象被修改时 store 或模块间数据互相污染的问题。
实际上这和 Vue 组件内的
data是同样的问题
使用一个函数来声明模块状态（仅 2.3.0+ 支持）：
const MyReusableModule = {
state () {
return {
foo: ‘bar‘
}
},
// mutation, action 和 getter 等等...
}module.js
import Vue from ‘vue‘;
import ‘es6-promise/auto‘
import Vuex from ‘vuex‘;
Vue.use(Vuex);
const moduleA = {
namespaced: true,
state: {
name: ‘ModuleA‘,
count: 0,
price: 0,
total: 0,
},
getters: {
//計算moduleA中的count狀態值與root store中的count狀態值 之間的差值
countDistanceWithRootCount(state, getters, rootState) {
return state.count - rootState.count;
},
},
mutations: {
increment(state) {
state.count++;
state.total = state.price * state.count;
},
setName(state, payload) {
state.name = payload.name;
},
calculate(state, payload) {
state.total = state.price * payload;
},
},
actions: {
//儅大於主節點的count值時，使用主節點的count
useRootCountIfCountOverClocked({state, commit, rootState}) {
if (state.count > rootState.count) {
commit(‘calculate‘, rootState.count);
}
},
},
};
const moduleStore = new Vuex.Store({
state: {
count: 10,
},
modules: {
accountA: moduleA,
},
mutations: {
calculate(state, payload) {
//root store中同名的calculate方法
console.log(‘called!‘);
},
},
});
export default moduleStore;
app.js
/** * First we will load all of this project‘s JavaScript dependencies which * includes Vue and other libraries. It is a great starting point when * building robust, powerful web applications using Vue and Laravel. */ require(‘./bootstrap‘); window.Vue = require(‘vue‘); // import store from ‘./Vuex/index‘; import store from ‘./Vuex/module.js‘; /** * * The following block of code may be used to automatically register your * Vue components. It will recursively scan this directory for the Vue * components and automatically register them with their "basename". * * Eg. ./components/ExampleComponent.vue -> <example-component></example-component> */ // const files = require.context(‘./‘, true, /\.vue$/i) // files.keys().map(key => Vue.component(key.split(‘/‘).pop().split(‘.‘)[0], files(key).default)) Vue.component(‘example-component‘, require(‘./components/ExampleComponent.vue‘).default); Vue.component(‘store-component‘, require(‘./components/StoreComponent.vue‘).default); Vue.component(‘module‘, require(‘./components/ModuleStore.vue‘).default); /** * Next, we will create a fresh Vue application instance and attach it to * the page. Then, you may begin adding components to this application * or customize the JavaScript scaffolding to fit your unique needs. */ const app = new Vue({ el: ‘#app‘, store, });
ModuleStore.vue:
<template> <div> <table> <tr> <th>name</th> <th>count</th> <th>price</th> <th>total</th> </tr> <tr> <td>{{name}}</td> <td>{{count}}</td> <td>{{price}}</td> <td>{{total}}</td> </tr> </table> </div> </template> <script> // import {mapState, mapActions, mapMutations, mapGetters} from ‘vuex‘; import {createNamespacedHelpers} from ‘vuex‘; const {mapState, mapActions, mapMutations, mapGetters} = createNamespacedHelpers(‘accountA‘); export default { name: "ModuleStore", data: function () { return { pName: ‘‘, pCount: 0, pPrice: 0, pTotal: 0, } }, computed: { // ...mapState(‘accountA‘, [ // ‘name‘, // ‘count‘, // ‘price‘, // ‘total‘, // ]), ...mapState([ ‘name‘, ‘count‘, ‘price‘, ‘total‘, ]), ...mapActions([ ‘useRootCountIfCountOverClocked‘, ]), }, } </script> <style scoped> </style>
web.php:
<?php use Illuminate\Support\Facades\Route; /* |-------------------------------------------------------------------------- | Web Routes |-------------------------------------------------------------------------- | | Here is where you can register web routes for your application. These | routes are loaded by the RouteServiceProvider within a group which | contains the "web" middleware group. Now create something great! | */ Route::get(‘/‘, function () { return view(‘welcome‘); }); Auth::routes(); Route::get(‘/home‘, ‘HomeController@index‘)->name(‘home‘); Route::get(‘/store-test‘, function (Request $request) { return view(‘store‘); }); Route::get(‘/module‘, function (Request $request) { return view(‘module‘); });
标签：back style int tac cad php 差值 mamicode 接收
原文地址：https://www.cnblogs.com/dzkjz/p/12771110.html
