How to modify global variables in uniapp

Uniapp's method of modifying global variables: 1. Obtain global variables on a normal page and reassign values; 2. Manage global variables through Vue's state management tool vuex, the code is [let str = contObj.str;].

The operating environment of this tutorial: windows7 system, uni-app2.5.1 version. This method is suitable for all brands of computers.

Recommended (free): uni-app development tutorial

How to modify global variables in uniapp:

1. Quote Public common.js (1. Common.js can be introduced directly into the page. 2. Referenced and mounted in main.js (here is the second type))

export default {
    memberObj:{
        name:'初始姓名',
    },
    setMemberObj(data){
        this.memberObj = Object.assign({},this.memberObj,data) 
    }
}

(1). In the global main. Referenced in js

import Vue from 'vue'
import App from './App'
import member from './common/common.js'
import store from './store'
Vue.config.productionTip = false
Vue.prototype.$store = store
Vue.prototype.$member = member;
Vue.prototype.$enName = 'ming';
App.mpType = 'app'
const app = new Vue({
    store,
    ...App
})
app.$mount()

Get global variables on ordinary pages and reassign them

onShow:function(){
    //获取全局设置的变量
    this.memberData = this.$member.memberObj;
    console.log(this.memberData);
    //输出值{name:'初始姓名'}
},
methods: {
  bindLogin() {
    let that = this;
    let obj = {
        name:'爱尚',
        sex:'男'
    }
    that.$member.setMemberObj(obj);
  },
}
//再次在别的页面调用时内容已发生变化
console.log(this.$member.memberObj)
//{name:'爱尚',sex:'男'}

2. Manage global variables through Vue’s state management tool vuex

1、创建store文件，store.js
import Vue from 'vue'
import Vuex from 'vuex'
Vue.use(Vuex)
const store = new Vuex.Store({
    state: {
        memberData:'',
        initName:''
    },
    mutations: {
        copy(state,cont){
            //单一的改变某一个变量
            console.log(state)
            console.log(cont)
            state.memberData = cont;
        },
        change(state,contObj){
            //通过传入的变量去改变对应的全局变量
            let str = contObj.str;
            let cont = contObj.cont;
            state[str] = cont;
        },
    },
    actions:{
        copeFun:function(context,mData){
            context.commit('copy',mData)
        },
        changeFun:function(context,obj){
            context.commit('change',obj)
        }
    }
})
export default store

1. In main. Introduce store.js

import Vue from 'vue'
import App from './App'
import store from './store';
Vue.config.productionTip = false;
Vue.prototype.$store = store;
App.mpType = 'app';
const app = new Vue({
    store,
    ...App
})
app.$mount()

2 into js. Get the global variables that need to be used in the page

(1). Get them directly through global mounting (defined in the calculated attribute It is to facilitate real-time monitoring variable reassignment)

1、直接通过全局挂载的那种方式去获取
computed:{
   memberData:function(){
      return this.$store.state.memberData;
   },
},

(2), get it by introducing vuex into the page

import {mapState,mapMutations} from "vuex"；
computed:{
　　//正常写法
    ...mapState({
        memberData:state => state.memberData,
        initName:state => state.initName,
    })
　　//当变量名一致时（简写）
　　//...mapState(['initName','memberData'])
},

3, reassign the global variable in vuex

methods:{
    //单一方法改变指定的变量
  changeMember:function(){
    let mem = {
        name:'爱尚丽明',
        age:'28'
    }
    this.$store.dispatch('copeFun',mem)
    },      
       //通过传入要改的变量名进行改变变量
    changeMemberPub:function(){
      let memberData = {
        name:'爱尚',
        age:25
    }
    let $obj = {}
    $obj.cont = memberData ;
    $obj.str = 'memberData'
    this.$store.dispatch('changeFun',$obj)
   }       
}

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