Detailed explanation of Vue's simple store

const state = {
    msg: 'This is my status',
}
export default {
    state
}

const getters = {
    msg:state => state.mystate.msg,
}
export default getters

import Vue from 'vue'
import Vuex from 'vuex'
import getters from './getters'
Vue.use(Vuex)
// https://webpack.js.org/guides/dependency-management/#requirecontext
const modulesFiles = require.context('./modules', true, /\.js$/)
// It will automatically require all vuex modules in your module file // you do not need `import app from './modules/app'`
// it will auto require all vuex modules from modules file
const modules = modulesFiles.keys().reduce((modules, modulePath) => {
  // set './app.js' => 'app'
  const moduleName = modulePath.replace(/^\.\/(.*)\.\w+$/, '$1')
  const value = modulesFiles(modulePath)
  modules[moduleName] = value.default
  return modules
}, {})
const store = new Vuex.Store({
  modules,
  getters,
})
export default store

import Vue from 'vue'
import Vuex from 'vuex'
import getters from './getters'
Vue.use(Vuex)
// https://webpack.js.org/guides/dependency-management/#requirecontext
const modulesFiles = require.context('./modules', true, /\.js$/)
// It will automatically require all vuex modules in your module file // you do not need `import app from './modules/app'`
// it will auto require all vuex modules from modules file
const modules = modulesFiles.keys().reduce((modules, modulePath) => {
  // set './app.js' => 'app'
  const moduleName = modulePath.replace(/^\.\/(.*)\.\w+$/, '$1')
  const value = modulesFiles(modulePath)
  modules[moduleName] = value.default
  return modules
}, {})
const store = new Vuex.Store({
  modules,
  getters,
})
export default store

import Vue from 'vue'
import Vuex from 'vuex'
import getters from './getters'
Vue.use(Vuex)
// https://webpack.js.org/guides/dependency-management/#requirecontext
const modulesFiles = require.context('./modules', true, /\.js$/)
// It will automatically require all vuex modules in your module file // you do not need `import app from './modules/app'`
// it will auto require all vuex modules from modules file
const modules = modulesFiles.keys().reduce((modules, modulePath) => {
  // set './app.js' => 'app'
  const moduleName = modulePath.replace(/^\.\/(.*)\.\w+$/, '$1')
  const value = modulesFiles(modulePath)
  modules[moduleName] = value.default
  return modules
}, {})
const store = new Vuex.Store({
  modules,
  getters,
})
export default store

<template>
  <div id="app">
   <router-view></router-view>
  </div>
</template>
<script>
export default {
  name: 'App'
}
</script>
<style>
#app {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>

<template>
  <div class="hello">
    <img src="../assets/logo.png" />
    <br />
    <input v-model="msg"/>
    <h2>{{ msg }}</h2>
    <router-link to="/two">I want to go to the second page</router-link>
  </div>
</template>
<script>
export default {
  name: "HelloWorld",
  data() {
    return {
      msg: "Welcome to new vue project",
    };
  },
  methods: {
    setstate(value) {
      sessionStorage.setItem('msg', value);
    },
  },
  watch:
    msg(newName, oldName) {
      this.setstate(newName);
    },
  },
};
</script>
<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
a {
  color: #42b983;
}
</style>

<template>
  <div>
    This is the second page<h2>{{ msg }}</h2>
    <router-link to="/">I want to go back</router-link>
  </div>
</template>

<script>
export default {
  data() {
    return {
      msg: "",
    };
  },
  methods: {
    setmsg() {
        this.msg = sessionStorage.getItem('msg');
    },
  },
  created(){
      this.setmsg()
  }
};
</script>