前言，突然想试试vuex，以前只是单纯的以为vuex只是存储一个状态，今天看了一个github上的一个项目，我看别人把需要的数据也放在vuex上面，我不知道这样利不利于优化，但是我知道这样会方便一些，你需要的数据直接从vuex里面取就好了。

/src/main.js

import Vue from 'vue';
import iView from 'iview';
import {router} from './router/index';
import {appRouter} from './router/router';
import store from './store';
import App from './app.vue';
import '@/locale';
import 'iview/dist/styles/iview.css';
import VueI18n from 'vue-i18n';
import util from './libs/util';

Vue.use(VueI18n);
Vue.use(iView);

new Vue({
    el: '#app',
    router: router,
    store: store,
    render: h => h(App),
    data: {
        currentPageName: ''
    },
    mounted () {
        this.currentPageName = this.$route.name;
        // 显示打开的页面的列表
        this.$store.commit('setOpenedList');
        this.$store.commit('initCachepage');
        // 权限菜单过滤相关
        this.$store.commit('updateMenulist');
        // iview-admin检查更新
        util.checkUpdate(this);
    },
    created () {
        let tagsList = [];
        appRouter.map((item) => {
            if (item.children.length <= 1) {
                tagsList.push(item.children[0]);
            } else {
                tagsList.push(...item.children);
            }
        });
        this.$store.commit('setTagsList', tagsList);
    }
});

/src/store/index.js

import Vue from 'vue';
import Vuex from 'vuex';

import app from './modules/app';

Vue.use(Vuex);

const store = new Vuex.Store({
    state: {
        //
    },
    mutations: {
        
    },
    actions: {
		//
    },
    modules: {
        app,
    }
});

export default store;

/src/store/modules/app.js

import {otherRouter, appRouter} from '@/router/router';
import Util from '@/libs/util';
import Cookies from 'js-cookie';
import Vue from 'vue';

const app = {
    state: {
        cachePage: [],
        lang: '',
        isFullScreen: false,
        openedSubmenuArr: [], // 要展开的菜单数组
        menuTheme: 'dark', // 主题
        themeColor: '',
        pageOpenedList: [{
            title: '首页',
            path: '',
            name: 'home_index'
        }],
        currentPageName: '',
        currentPath: [
            {
                title: '首页',
                path: '',
                name: 'home_index'
            }
        ], // 面包屑数组
        menuList: [],
        routers: [
            otherRouter,
            ...appRouter
        ],
        tagsList: [...otherRouter.children],
        messageCount: 0,
        dontCache: ['text-editor', 'artical-publish'] // 在这里定义你不想要缓存的页面的name属性值(参见路由配置router.js)
    },
    mutations: {
        setTagsList (state, list) {
            state.tagsList.push(...list);
        },
        updateMenulist (state) {
            let accessCode = parseInt(Cookies.get('access'));
            let menuList = [];
            appRouter.forEach((item, index) => {
                if (item.access !== undefined) {
                    if (Util.showThisRoute(item.access, accessCode)) {
                        if (item.children.length === 1) {
                            menuList.push(item);
                        } else {
                            let len = menuList.push(item);
                            let childrenArr = [];
                            childrenArr = item.children.filter(child => {
                                if (child.access !== undefined) {
                                    if (child.access === accessCode) {
                                        return child;
                                    }
                                } else {
                                    return child;
                                }
                            });
                            menuList[len - 1].children = childrenArr;
                        }
                    }
                } else {
                    if (item.children.length === 1) {
                        menuList.push(item);
                    } else {
                        let len = menuList.push(item);
                        let childrenArr = [];
                        childrenArr = item.children.filter(child => {
                            if (child.access !== undefined) {
                                if (Util.showThisRoute(child.access, accessCode)) {
                                    return child;
                                }
                            } else {
                                return child;
                            }
                        });
                        if (childrenArr === undefined || childrenArr.length === 0) {
                            menuList.splice(len - 1, 1);
                        } else {
                            let handledItem = JSON.parse(JSON.stringify(menuList[len - 1]));
                            handledItem.children = childrenArr;
                            menuList.splice(len - 1, 1, handledItem);
                        }
                    }
                }
            });
            state.menuList = menuList;
        },
        changeMenuTheme (state, theme) {
            state.menuTheme = theme;
        },
        changeMainTheme (state, mainTheme) {
            state.themeColor = mainTheme;
        },
        addOpenSubmenu (state, name) {
            let hasThisName = false;
            let isEmpty = false;
            if (name.length === 0) {
                isEmpty = true;
            }
            if (state.openedSubmenuArr.indexOf(name) > -1) {
                hasThisName = true;
            }
            if (!hasThisName && !isEmpty) {
                state.openedSubmenuArr.push(name);
            }
        },
        closePage (state, name) {
            state.cachePage.forEach((item, index) => {
                if (item === name) {
                    state.cachePage.splice(index, 1);
                }
            });
        },
        initCachepage (state) {
            if (localStorage.cachePage) {
                state.cachePage = JSON.parse(localStorage.cachePage);
            }
        },
        removeTag (state, name) {
            state.pageOpenedList.map((item, index) => {
                if (item.name === name) {
                    state.pageOpenedList.splice(index, 1);
                }
            });
        },
        pageOpenedList (state, get) {
            let openedPage = state.pageOpenedList[get.index];
            if (get.argu) {
                openedPage.argu = get.argu;
            }
            if (get.query) {
                openedPage.query = get.query;
            }
            state.pageOpenedList.splice(get.index, 1, openedPage);
            localStorage.pageOpenedList = JSON.stringify(state.pageOpenedList);
        },
        clearAllTags (state) {
            state.pageOpenedList.splice(1);
            state.cachePage.length = 0;
            localStorage.pageOpenedList = JSON.stringify(state.pageOpenedList);
        },
        clearOtherTags (state, vm) {
            let currentName = vm.$route.name;
            let currentIndex = 0;
            state.pageOpenedList.forEach((item, index) => {
                if (item.name === currentName) {
                    currentIndex = index;
                }
            });
            if (currentIndex === 0) {
                state.pageOpenedList.splice(1);
            } else {
                state.pageOpenedList.splice(currentIndex + 1);
                state.pageOpenedList.splice(1, currentIndex - 1);
            }
            let newCachepage = state.cachePage.filter(item => {
                return item === currentName;
            });
            state.cachePage = newCachepage;
            localStorage.pageOpenedList = JSON.stringify(state.pageOpenedList);
        },
        setOpenedList (state) {
            state.pageOpenedList = localStorage.pageOpenedList ? JSON.parse(localStorage.pageOpenedList) : [otherRouter.children[0]];
        },
        setCurrentPath (state, pathArr) {
            state.currentPath = pathArr;
        },
        setCurrentPageName (state, name) {
            state.currentPageName = name;
        },
        setAvator (state, path) {
            localStorage.avatorImgPath = path;
        },
        switchLang (state, lang) {
            state.lang = lang;
            Vue.config.lang = lang;
        },
        clearOpenedSubmenu (state) {
            state.openedSubmenuArr.length = 0;
        },
        setMessageCount (state, count) {
            state.messageCount = count;
        },
        increateTag (state, tagObj) {
            if (!Util.oneOf(tagObj.name, state.dontCache)) {
                state.cachePage.push(tagObj.name);
                localStorage.cachePage = JSON.stringify(state.cachePage);
            }
            state.pageOpenedList.push(tagObj);
            localStorage.pageOpenedList = JSON.stringify(state.pageOpenedList);
        }
    }
};

export default app;

##上面是大佬的项目，我直接粘出源码了，下面是我模仿写的简化版

/src/main.js

import Vue from 'vue'
import App from './App'
import router from './router'
import store from './store'
import baseURL from './common/baseURL'
import iview from 'iview'
import 'iview/dist/styles/iview.css';
Vue.use(iview)
Vue.config.productionTip = false

/* eslint-disable no-new */
new Vue({
  el: '#app',
  router,
  store,
  components: { App },
  template: '<App/>'
})

/src/store/index.js

import Vue from 'vue'
import Vuex from 'vuex'
import app from './modules/app'
Vue.use(Vuex)
export default new Vuex.Store({
    modules:{ //当多个状态的时候，我们会书写很多的代码，为了拆分模块化，所以我们可以在其他地方定义，然后在modules里面整合。官方文档有介绍。。。。。
        app
    }
})

/src/store/modules/app.js

const app = {
    state: {
        count: 1,
    },
    mutations: {
        changeCount (state) {
            state.count ++
        }
    }
}
export default app;

组件中使用

export default {
	methods: {
		methodsCount () {
		//找到实例使用commit触发（更改）count的状态。
			this.$store.commit('app/changeCount')
		}
	}
}