vuex

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/luobosiji/article/details/90696216 Vuex 状态管理 运行机制 Vuex 使用 npm install vuex --save import Vuex from 'vuex' Vue.use(Vuex) const app = new Vue ( { el : '#app' , // 把 store 对象提供给 “store” 选项，这可以把 store 的实例注入所有的子组件 //需调用 Vue.use(Vuex) store , //子组件能通过 this.$store 访问到。 } ) 通过 this.$store.state.xxx 来访问 通过 this.$store.commit('xxx',{arg}) 来提交修改数据操作(Mutation) 通过 this.$store.dispatch('xxx',{arg}) 来进行异步修改数据操作(Action) 通过 this.$store.getter.xxx 来访问store的计算属性 store const store = new Vuex . Store ( { state : { count : 1 , //响应式数据 todos : [ { id : 1 , text : '...

第一次知道单例模式，是看的java21种设计模式，当时对于里面讲的懒汉式、饿汉式啥的都不太明白什么意思，就只是知道单例模式里面还有这两种区别。 既然这几天看的vuex是使用了这种模式，那么就特地写一篇博客来谈谈现在我对单例模式的理解吧。 一、名词解释、结合vuex 单例模式，顾名思义，就是只有一个实例化对象。也就是说在内存中他的地址是唯一的，但是可以到处引用，因此： 单例模式要求类能够有返回对象一个引用和一个获得该实例的方法。这是java中的释义，因为java中方法从属于某个类（其实在ES6中也已经支持class的写法了） 所以，针对上一篇的vuex的单例模式，你会看到如下代码： const store = new Vuex.Store({ modules: { header, sidebar, topbar, user, program, evaluation }, getters }) export default store 这是模块化的写法，但是你不难看出，他对外暴露了一个对象的引用（Vuex对象），然后在main.js中： new Vue({ el: '#app', router, store, i18n, render: h => h(App) }) 这样一来，全局注册store使得我们能在全局使用store，又因为这个store是对象的引用

Vuex是一个专为Vue服务，用于管理页面数据状态、提供统一数据操作的生态系统。它集中于MVC模式中的Model层，规定所有的数据操作必须通过 action - mutation - state change 的流程来进行，再结合Vue的数据视图双向绑定特性来实现页面的展示更新。统一的页面状态管理以及操作处理，可以让复杂的组件交互变得简单清晰，同时可在调试模式下进行时光机般的倒退前进操作，查看数据改变过程，使code debug更加方便。 最近在开发的项目中用到了Vuex来管理整体页面状态，遇到了很多问题。决定研究下源码，在答疑解惑之外，能深入学习其实现原理。 先将问题抛出来，使学习和研究更有针对性： 1. 使用Vuex只需执行 Vue.use(Vuex) ，并在Vue的配置中传入一个store对象的示例，store是如何实现注入的？ 2. state内部是如何实现支持模块配置和模块嵌套的？ 3. 在执行dispatch触发action（commit同理）的时候，只需传入（type, payload），action执行函数中第一个参数store从哪里获取的？ 4. 如何区分state是外部直接修改，还是通过mutation方法修改的？ 5. 调试时的“时空穿梭”功能是如何实现的？ 注：本文对有Vuex有实际使用经验的同学帮助更大，能更清晰理解Vuex的工作流程和原理

This was the question got me stuck for a little bit. Unfortunately, I coudn't find answer here ( asking also didn't help ). So after doing some research and asking here and there, it seems that I got the solution to this issue. If you have a question that you already know the answer to, and you would like to document that knowledge in public so that others (including yourself) can find it later. Of course, my answer may not be the ideal one, moreover I know it is not, that's the key point why I'm posting - to improve it. Note, I'm not using actions in example. The idea is the same. Let's begin

I want to access state.session in instance.js from records_view.js . How is this accomplished? store/modules/instance.js const state = { // This is what I want to access in records_view.js session: {} }; const getters = { sessionGetter: state => state.session }; store/modules/records_view.js const actions = { getSettingsAction (context, props) { // This is how I'm trying to access session, which doesn't work let session = context.state.instance.session; Api( context, { noun: props.noun, verb: 'GetRecordsViewSettings', orgUnitKey: _.has(session, 'orgunit.key') ? session.orgunit.key : '', data:

vuex的优点 1.解决了非父子组件的消息传递（将数据存放在state中） 2.减少了AJAX请求次数，有些情景可以直接从内存中的state获取 vuex的缺点 1.刷新浏览器，vuex中的state会重新变为初始状态 解决方案vuex-along 得配合计算属性和sessionStorage来实现 来源： https://www.cnblogs.com/SallyShan/p/11758556.html

I'm trying to switch to using Vuex instead of my homegrown store object, and I must say I'm not finding the docs as clear as elsewhere in the Vue.js world. Let's say I have a Vuex module called 'products', with its own state, mutations, getters, etc. How do I reference an action in that module called, say, 'clearWorking Data'? The docs give this example of accessing a module's state: store.state.a // -> moduleA's state But nothing I can see about getters, mutations, actions, etc. In your example it would be store.dispatch('products/clearWorkingData') you can think of actions/mutations as a

I have the following setup for my actions: get1: ({commit}) => { //things this.get2(); //this is my question! }, get2: ({commit}) => { //things }, I want to be able to call one action from within another, so in this example I want to be able to call get2() from within get1() . Is this possible, and if so, how can I do it? You have access to the dispatch method in the object passed in the first parameter: get1: ({ commit, dispatch }) => { dispatch('get2'); }, This is covered in the documentation . 来源： https://stackoverflow.com/questions/45848974/call-an-action-from-within-another-action

For such component <template> <div> <router-link :to="{name:'section', params: { sectionId: firstSectionId }}">Start</router-link> </div> </template> <script lang="ts"> import { mapActions } from "vuex" export default { mounted() { this.getSectionId() }, computed: { firstSectionId() { return this.$store.state.firstSectionId } }, methods: mapActions(["getSectionId"]) } </script> Store: const store: any = new Vuex.Store({ state: { firstSectionId: null }, // actions, // mutations }) I have a web request in the getSectionId action and it asynchronously fetches data and calls a mutation that will

I am trying to authenticate a user using vuejs and laravel's passport. I am not able to figure out how to send multiple parameters to the vuex mutation via an action. - store - export default new Vuex.Store({ state: { isAuth: !!localStorage.getItem('token') }, getters: { isLoggedIn(state) { return state.isAuth } }, mutations: { authenticate(token, expiration) { localStorage.setItem('token', token) localStorage.setItem('expiration', expiration) } }, actions: { authenticate: ({ commit }, token, expiration) => commit('authenticate', token, expiration) } }) - login method - login() { var data = {