leave-unused/store/readme.md

#引入vuex状态机
在根目录创建store目录

#在main.js引入store、注册store、挂载store在程序上
import Vue from 'vue';
import App from './App';
#import store from './store'
#Vue.prototype.$store = store

const app = new Vue({
#	store,
    ...App
})
app.$mount()


#在页面内使用store的属性
<view @tap="add"></view>
import { mapState,mapGetters,mapMutations } from 'vuex'//引入mapState
export default {
		data() {
			return {}
		},
#单纯访问属性值
		computed:{
		 	tokenEv() {
		 		return this.$store.state.token;
		 	}
		},
		<!-- 
		 需要引入 import { mapState } from 'vuex'//引入mapState
		 -->
		computed:mapState({
		 	// 从state中拿到数据 箭头函数可使代码更简练
		 	token: state => state.token,
		}),
		computed:mapState(['token']),
		computed: {
		 	...mapState({
		 		token: function (state) {
		 			return '追加的' +  state.token 
		 		},
		 		userInfo: state => state.userInfo,
		 	})
		},
		computed:{
		 	...mapState([
		 		'token',
		 		'userInfo',
		 		'count',
		 		'obj'
		 	])
		},
		computed: {
			...mapState({
				token: state => state.moduleA.token,
				count: state => state.moduleB.count
			}),
		},
#单纯访问方法
		computed: {
		 	todos() {
		 		return this.$store.getters.doneTodos
		 	}
		},
		computed: {
		 	doneTodosCount() {
		 		return this.$store.getters.doneTodosCount
		 	}
		},
		<!-- 方法传值 -->
		computed: {
		 	getTodoById() {
		 		return this.$store.getters.getTodoById(1)
		 	}
		},
		<!-- 
		 需要引入 import { mapGetters } from 'vuex'//引入mapState
		 -->
		computed: {
		 	// 使用对象展开运算符将 getter 混入 computed 对象中
		 	...mapGetters([
		 		'doneTodos',
		 		'doneTodosCount',
		 		'getTodoById'
		 		// ...
		 	])
		},
		onLoad(options) {
#改变状态机里面的值		
			<!-- 传递字符串改变 -->			
			this.$store.commit('setToken', 'token已改变');
			<!-- 传递对象 -->
			this.$store.commit('updateUserInfo',{userInfo:'用户信息'})
			this.$store.commit({
				type: 'updateUserInfo',
				userInfo: '新方式更新用户信息'
			})
			this.$store.commit('newProp',{c:'吃火锅'})
			<!-- 输出值 -->
			console.log(this.token);
			<!-- 调用方法 -->
			this.add();
			<!-- 必须是同步方法 -->
			this.$store.dispatch('addCountAction')
			this.$store.dispatch('addCountAction2',{amount:10})
			<!-- 异步方法 -->
			this.$store.dispatch('addCountAction3',{amount:30})
			setTimeout(()=>{
			 	console.log(this.count,388);
			},3000)
		},
		methods: {
			<!-- 
			 需要引入 import { mapMutations } from 'vuex'//引入mapState
			 -->
			...mapMutations(['add']),//对象展开运算符直接拿到add
		}
	}