mall-applet1/store/readme.md

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#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
}
}