一起幫忙解決難題,拯救IT 人的一天 | vuex mapgetter example
為什麼需要使用getters?在某些時候我們需要computedstore`中的state,例如在todolist內取得完成的數量。computed:{doneTodosCount(){returnthis.$store.state.todos.filter(todo=>todo.done).length}}但是如果有多個組件要使用相同功能呢?我們要複製上面的程式碼到每個組件內嗎?還是要將他抽取出來成為一個helper?其實這兩個做法都不太理想。getters使用方式還好,Vuex允許我們在store中定義getters,getters就類似組件中的computed,getters的返回值會根據他依賴的關係被緩存起來,只有當他依賴的值發生改變才會重新被計算。...
為什麼需要使用 getters ?在某些時候我們需要 computed store` 中的 state ,例如在 to do list 內取得完成的數量。
computed: { doneTodosCount () { return this.$store.state.todos.filter(todo => todo.done).length } }但是如果有多個組件要使用相同功能呢?我們要複製上面的程式碼到每個組件內嗎?還是要將他抽取出來成為一個 helper ?其實這兩個做法都不太理想。
getters 使用方式還好, Vuex 允許我們在 store 中定義 getters ,getters 就類似組件中的 computed , getters 的返回值會根據他依賴的關係被緩存起來,只有當他依賴的值發生改變才會重新被計算。
使用 stategetters 可以將 state 作為第一個參數
const store = new Vuex.Store({ state: { todos: [ { id: 1, text: ..., done: true }, { id: 2, text: ..., done: false } ] }, getters: { doneTodos: state => { return state.todos.filter(todo => todo.done) } } })我們在組件中即可以下面方式來取得 doneTodos :
computed: { doneTodos() { return this.$store.getters.doneTodos; }, } // [ { "id": 1, "text": "...", "done": true } ] 使用其他 gettersgetters 可以將其他 getters 作為第二個參數
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2018年1月4日 — mapGetters and mapActions are basically a helper provided by vuex which returns an object with keys as method names and values as methods ... Read More
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2022年1月21日 — If you simply want to use mapGetters to access data store in vuex state you can do it as you have it above, without the get/set computed. Read More
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