vuex 存储数据,页面刷新不缓存入门基础知识
html login.vue 这是登录需要储存的
this.$httpPostService('/member/user/doLogin', {
username: that.userName,
password: that.userPassword,
code: that.verCode
}).then(res => {
console.log(res);
//JSON.stringify是把json对象转化成字符串
localStorage.setItem("userInfo", JSON.stringify(res)) //只有用本地存储页面刷新的时候才不会被清掉
this.$store.commit("setPrint", { // 这个使用的是mutations里面方法的调用
userInfo: res
})
this.$router.push("index");
}).catch(err => {
console.log(err)
})
store.js 建一个store文件夹把js放里面 在main.js 里面引入并全局注册
main.js
import Vue from 'vue'
import App from './App'
import router from './router'
import { httpPostService, httpGetService } from "./network/axios";
Vue.prototype.$httpPostService = httpPostService;
Vue.prototype.$httpGetService = httpGetService;
import store from './store/store' //这是引入的
import vueTitle from 'vue-wechat-title' // 设置title
Vue.use(vueTitle)
import Mint from 'mint-ui';
Vue.use(Mint);
import 'mint-ui/lib/style.css';
import './assets/less/common.less'
Vue.config.productionTip = false;
/* eslint-disable no-new */
new Vue({
el: '#app',
router,
store,
components: {
App
},
template: '<App/>'
})
store.js
import Vue from 'vue';
import Vuex from 'vuex';
Vue.use(Vuex);
const state = {
userInfo: localStorage.getItem('userInfo') || {} //从缓存里面拿到的数据
};
const getters = {};
const actions = {};
const mutations = {
setPrint(state, userInfo) {
state.userInfo = userInfo;
}
};
export default new Vuex.Store({
state,
getters,
actions,
mutations
})
全局注册 需要在app.vue里面
<template>
<div id="app">
<router-view/>
</div>
</template>
<script>
export default {
name: 'App',
data() {
return {
}
},
mounted() {
//在页面加载时读取localStorage里的状态信息
localStorage.getItem("userInfo") && this.$store.replaceState(Object.assign(this.$store.state, JSON.parse(localStorage.getItem("userInfo"))));
//在页面刷新时将vuex里的信息保存到localStorage里
window.addEventListener("beforeunload", () => {
localStorage.setItem("userInfo", JSON.stringify(this.$store.state))
})
}
}
</script>
结语
vuex 存的是内存 localStorage是浏览器提供的接口,让你存的是接口,以文件的形式存储到本地这是它们本质的区别
localStorage 保存对象的时候,需要先将对象转换成json字符串,然后获取的时候在转换成对象形式