> ## 1，vuex
```
index.js 用来暴露
`
import Vue from'vue'
import Vuex from 'vuex'
Vue.use(Vuex)
conststore = newVuex.Store({
modules: {
app,
},
getters
})
export default store
`
getters.js 用来定义值
`
constgetters = {
sidebar:state=>state.app.sidebar,
}
export default getters
`
app.js 用来写函数
`
const app = {
state: {
once: '' "
},
mutations: {
SET_ONCE: (state, value) => {
state.once= value
}
},
actions: {
setOnce({ commit }){
commit('SET_ONCE', value)
}
}
}
export default app
`
index.vue 调用方法
`
this.$store.dispatch('setLanguage', lang)
`
```