VueX的使用

Vuex适用于多个子路由，子组件之间传参，如果程序简单，可以使用eventbus

1、VueX文件

import Vue from 'vue'
import Vuex from 'vuex'

Vue.use(Vuex)

export default new Vuex.Store({
    state: {
        gradeId: "",
        subjectId: "",
    },
    mutations: {
        setgradeid (state, value) {
            state.gradeId = value;
        },
        setsubjectid (state, value) {
            state.subjectId = value;
        }
    },
    actions: {
        setGradeId (context, value) {
            context.commit('setgradeid', value)
        },
        setSubjectid (context, value) {
            context.commit('setsubjectid', value)
        }
    }
})

 

2、引入Vuex,main.js文件

import store from './store'

new Vue({
  router,
  store,
  render: h => h(App)
}).$mount('#app')

3、设置Vuex的值

        getSubject: function (value) {
            this.nowSubject = value;
            this.$store.dispatch('setSubjectid', value);
        }

 

4、读取VueX的值&监控VueX值的变化

this.$store.state.gradeId

    computed: {
        getgradeId() {
            return this.$store.state.gradeId;
        },
        getsubjectId() {
            return this.$store.state.subjectId;
        },
    },
    watch: {
        //如果路由发生了变化，更新页面数据
        $route(to, from) {
            if (to.path !== from.path) {
                this.schoolID = this.$route.params.id;
            }
        },
        getgradeId(val) {
            this.gradeId = val ? val : 0;
            this.init();
        },
        getsubjectId(val) {
            this.subjectId = val ? val : 0;
            this.init();
        },
    },