Vue全局共享数据之globalData,vuex,本地存储的使用

getApp().globalData.text = 'test'

getApp().globalData.text='test'

//store下的index.js存储vuex数据
 
import Vue from "vue";
import Vuex from "vuex";
Vue.use(Vuex);
 
const vuexLocal = new VuexPersistence({
  storage: window.localStorage,
});
 
export default new Vuex.Store({
  state: {
    count:20
  },
  plugins: [vuexLocal.plugin],
});
 
 
 
//vue3
 
state: {
   passwordState:false,//登录状态
},
mutations:{
    // 设置修改登录状态的方法
    setPasswordState(state,value){
        state.passwordState = value; 
     },
}
 
 
 

//VUE2中VueX用法
 
import {mapState } from "vuex";
 
export default {
  computed: {
      ...mapState({count:'count'}),//方法2
  },
  computed: mapState({
    count: 'count', //方法3
    count: (Store) => Store.count, // 方法4
    count: function (Store) { // 方法5
      return '123:' + Store.count
    },
  }),
  methods:{
 
      submit2(){
        console.log(this.$store.state.count,"===");//方法1
        console.log(this.count,"count")
      }
 
  },
}
 
//vue3中VueX用法
 
const storeState=mapState(['count','name'])
const state={}
 
Object.keys(storeState).forEach(Key=>{
	const fn=storeState[Key].bind({$store:store})
	state[Key]=computed(fn)
})
 
 
//返回...state就行了
 
//（2）使用computed一个一个解析
 
import {useStore} from 'vuex'
import {computed} from 'vue'
 
const store=useStore()
const state=computed(()=>store.state.name)
======================================================
import { onMounted } from 'vue'
import { useStore } from 'vuex'
export default {
   setup(){
     //把useStore赋值
     const $store = useStore();
     onMounted(()=>{
        //拿到vuex的值
        console.log($store.state.passwordState) // false
        //改变vuex的值
        $store.commit('setPasswordState',true) //调用vuex的方法
        //再次打印
        console.log($store.state.passwordState) // true
     })
     return{
     
     }
   }
}

    // 将this.pickerItem的数据存储入insuranceCode,需提前转化成string类型
 
    pickerItem：{
        id: that.item.id,
        limit: 100,
        page: 1,
    }
//长期存储
    localStorage.setItem("insuranceCode", JSON.stringify(this.pickerItem));
//短期存储
    sessionStorage.setItem("insuranceCode", JSON.stringify(this.pickerItem));

//长期存储
localStorage.getItem("insuranceCode")
 
//短期存储
sessionStorage.getItem("insuranceCode")

    // 清除insuranceCode
 
    localStorage.removeItem("insuranceCode");
 
    sessionStorage.removeItem("insuranceCode");
 
    // 清除所有
 
    localStorage.clear();
 
    sessionStorage.clear();

//uni.setStorageSync(KEY,DATA) 存储
 
try {
	uni.setStorageSync('storage_key', 'hello');
} catch (e) {
	// error
}
 
 
 
 
 
//uni.getStorageSync(KEY)
 
//从本地缓存中同步获取指定 key 对应的内容。
 
 
try {
	const value = uni.getStorageSync('storage_key');
	if (value) {
		console.log(value);
	}
} catch (e) {
	// error
}