【error】vue-cli3 报Computed property “tableData” was assigned to but it has no setter.

对于vuex，使用getter获取state数据，并绑定到组件上，是很常规的操作

但是在严格模式下，在属于vuex的state上使用v-model这种需要双向绑定的数据类型，单单使用getter就会报错：

Computed property “searchWebName” was assigned to but it has no setter.

错误代码如下：

<!--vue-->
<template><el-form class="searchDiv"><el-form-item label="网站名称："><input class="inputC" v-model="searchWebName" placeholder="网站名称" /></el-form-item></el-form>
</template>
<script>
import { mapGetters, mapActions } from "vuex";
export default {computed: {...mapGetters(["searchWebName"]),}
}
</script><!--vuex-->
export default new Vuex.Store({state: {searchWebName:"",}getters: {searchWebName: state => {return state.searchWebName;},}
})

原因如下：在用户输入是，v-model会视图直接修改vuex中的state中的searchWebName，在严格模式下，由于这个修改不是在mutation函数中执行的，所以这里就会抛出一个错误.

1.使用监听事件提交更改的方式解决这个问题

用vuex的思维解决这个问题，监听input的输入事件，在事件回调中调用action修改state数据

<template>
<input :value="message" @input="updateMessage">
</template>
<script>
import{mapGetters} from "vuex";
export default{computed: {...mapState({message: state => state.obj.message})},methods: {updateMessage (e) {this.$store.commit('updateMessage', e.target.value)}}
}
</script>// ...
mutations: {updateMessage (state, message) {state.obj.message = message}
}

2.双向绑定的计算属性：使用带有Setter的双向绑定计算属性：

<!--vue-->
<template><el-form class="searchDiv"><el-form-item label="网站名称："><input class="inputC" v-model="searchWebName" placeholder="网站名称" /></el-form-item></el-form>
</template><script>
import { mapGetters, mapActions } from "vuex";
export default {computed: {...mapGetters(["listProject"]),searchWebName: {get() {return this.$store.state.searchWebName;},set(value) {this.$store.commit("SET_WENNAME", value);}},}}</script>
<!--vuex-->
export default new Vuex.Store({state: {listProject:[],searchWebName: '',},mutations: {SET_PROJECT_LIST: (state, {projectlist}) => {state.listProject= projectlist},SET_WENNAME(state, val) {state.searchWebName = val},},getters: {listProject: state => {return state.listProject;},}})

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【error】vue-cli3 报Computed property “tableData” was assigned to but it has no setter.

1.使用监听事件提交更改的方式解决这个问题

2.双向绑定的计算属性：使用带有Setter的双向绑定计算属性：

推荐使用第二种方式

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