问题描述
我的父组件是这样的:
<template>
...
<search-result/>
...
</template>
<script>
import {mapActions} from 'vuex'
...
export default {
...
props: ['category'],
mounted() {
this.updateCategory(this.category)
},
methods: {
...mapActions(['updateCategory']),
}
}
</script>
我的子组件是这样的:
<template>
...
</template>
<script>
import {mapGetters} from 'vuex'
...
export default {
...
mounted() {
console.log(this.getCategory)
},
computed: {
...mapGetters(['getCategory'])
},
}
</script>
我的模块 vuex 像这样在组件之间发送数据:
My modules vuex to send data between components like this :
import { set } from 'vue'
...
// initial state
const state = {
category: null
}
// getters
const getters = {
getCategory: state => state.category
}
// actions
const actions = {
updateCategory ({commit}, payload) {
commit(types.UPDATE_CATEGORY, payload)
}
}
// mutations
const mutations = {
[types.UPDATE_CATEGORY] (state, payload) {
state.category = payload
}
}
export default {
state,
getters,
actions,
mutations
}
我尝试过,但它不起作用
I try like that, but it does not works
如果代码执行了,子组件中console.log(this.getCategory)的结果为null
If the code executed, the result of console.log(this.getCategory) in the child component is null
例如父组件中的category prop = 7.子组件中console.log(this.getCategory)的结果是否应该= 7
For example category prop in the parent component = 7. Should the result of console.log(this.getCategory) in the child component = 7
为什么它不起作用?为什么结果为空?
Why it does not work? Why the result is null?
注意:
我可以通过 prop 发送类别数据.但在这里我不想使用道具.我想通过 vuex 商店发送数据.所以我只想通过vuex store设置和获取数据
I can just send the category data via prop. But here I do not want to use prop. I want to send data via vuex store. So I want to set and get data only via vuex store
推荐答案
Child 的 mounted
钩子在 parent 的 mounted
钩子之前执行.(为什么?见 此链接)
Child's mounted
hook is executed before parent's mounted
hook. ( why? See this link)
console.log(this.getCategory)
发生在 this.updateCategory(this.category)
之前.
因此,您在控制台中得到 null
.
Therefore, you get null
in the console.
如果您将 console.log(this.getCategory)
放在 updated
钩子中,您稍后将在控制台中获得正确的值.
If you put console.log(this.getCategory)
in updated
hook, you would be getting the right value in the console later on.
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