2-2 元件之間的溝通傳遞 | vue get component value
前面一個小節我們快速介紹了Vue.js元件系統的特性,以及元件內部的基本結構。那麼在這個小節中,我們繼續對元件與元件之間各種傳遞資料的方式來做說明。Props前面我們提到,Vue.js每個元件的實體狀態、模板等作用範圍都應該要是獨立的,這意味著我們不能(也不應該)在子元件的模組「直接」去修改父元件,甚至是另一個元件的資料,這樣除了元件因為耦合程度過高維護不易,也可能產生難以追蹤的錯誤。但是當我們切分元件的時候,就是希望能夠重複利用這個元件,我們希望這個元件可以根據「外部」傳入的資料來反映出不同的結果。那麼,...
前面一個小節我們快速介紹了 Vue.js 元件系統的特性,以及元件內部的基本結構。 那麼在這個小節中,我們繼續對元件與元件之間各種傳遞資料的方式來做說明。
Props前面我們提到,Vue.js 每個元件的實體狀態、模板等作用範圍都應該要是獨立的, 這意味著我們不能(也不應該)在子元件的模組「直接」去修改父元件,甚至是另一個元件的資料,
這樣除了元件因為耦合程度過高維護不易,也可能產生難以追蹤的錯誤。
但是當我們切分元件的時候,就是希望能夠重複利用這個元件,我們希望這個元件可以根據「外部」傳入的資料來反映出不同的結果。 那麼,既然不能直接取用,那麼上下層元件之間,若需要從外部引進資料時,就需要透過 props 屬性來引用外部的狀態。
使用方式很簡單,我們只要在自訂的子元件上使用上一章介紹過的 v-bind 指令:
<div id="app"> <h3>{{ msg }}</h3> <my-component v-bind:parent-msg="msg"></my-component> </div>1234567
const app = Vue.createApp({ data () { return { msg: 這是外層元件的 msg } } }); app.component(my-component, { template: ` <div class="component"> <div> 從 props 來的 parentMsg ==> {{ parentMsg }} </div> <div> 自己的 msg ==> {{ msg }} </div> </div>`, props: ["parentMsg"], data () { return { msg: 這是子元件的 msg } } }); app.mount(#app);12345678910...
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