在尝试 Vue 和 Vuex 时,我偶然发现了以下错误消息:
[Vue warn]: Property or method "msg" is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property. See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.
我没能理解和解决这个问题,主要是因为msg
定义在data
. 它可能与 Vuex 没有直接关系,但我只有在开始使用 Vuex 时才遇到它。
这是我的代码:
主.js:
import Vue from 'vue'
import App from './App.vue'
import { store } from './store.js'
Vue.component('app', App);
var vApp = new Vue({
el: '#app',
store,
render: h => h(App),
})
应用程序.vue:
<template>
<div id="app">
<div v-text="msg"></div>
<input id="name-b" class="input" v-model="nameB" type="text" placeholder="Name B">
</div>
</template>
<script type = "text/javascript">
module.exports = {
name: 'app',
data() {
return {
msg: 'boooo'
}
},
computed: {
return {
nameB: {
get() {
this.$store.state.nameB
},
set(value) {
this.$store.commit('setName', value);
}
},
}
</script>
<style>
</style>
商店.js:
import Vue from 'vue';
import Vuex from 'vuex';
Vue.use(Vuex);
export const store = new Vuex.Store({
state: {
nameB: '',
},
mutations: {
setName: function(state, name) { state.locationName = name},
},
});
谢谢。