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    # Vue.js 簡介 :::info Vue.js 最主要的核心功能有兩個部分:**宣告式渲染** 與 **元件系統**。 ::: ## 指令式渲染 vs 宣告式渲染 ### 指令式渲染 jQuery 和 JavaScript 在操作畫面時,大多是以操作 DOM 物件來處理。 像這種一個指令一個動作,以「操作 DOM 為基礎」的模式,稱為指令式渲染。 * 優點:簡單直覺,當事件和元素量少時,可以很直覺的對 DOM 進行操作。 * 缺點:專案規模增長,資料難以維護。 ### 宣告式渲染 以「宣告」的方式在模板(HTML)呈現 JavaScript 的資料,當資料更新時,Vue.js 會將資料狀態同步更新並渲染到模板。 也就是將資料/狀態統一交給 JavaScript 物件維護管理,網頁上的事件都是針對物件狀態進行操作,減少直接操作 DOM 的行為,已資料驅動畫面,也就是 MVVM 模式。 ## MVVM 模式 MVVM 分別由 Model、View 以及 ViewModel 這三個部分所組成。 * Model:狀態 * View:畫面 * ViewModel:將 Model 層與 View 層的狀態自動同步 Vue.js 將 DOM 的事件監聽和資料狀態綁定封裝起來,當使用者透過操作 View 或觸發網頁事件時,ViewModel 層的 Vue.js 就會將狀態回存到 Model,如果 Model 裡的狀態被修改了,就會同步更新到 View 的對應內容。 ![](https://i.imgur.com/PoXW7NF.png) ## 元件系統 網頁系統的根本是 DOM 模型(Document Object Model),每一個 DOM 單元(Node)可以組成 DOM Tree(組建樹)模式。 Vue.js 的元件系統就是基於此一概念加以簡化,讓最小單位可以是 Node 節點,也可以是組合好的元件單元(Component)。 每個元件都能有屬於自己的模板、程式邏輯、樣式,而這些元件組合起來就是原件樹(Component tree)。 ![](https://i.imgur.com/CyVGNJ3.png) ## 漸進式框架 > 漸進式框架代表著框架允許開發者以「漸進」的方式來挑選你所需的特性。 > 當專案的規模不需要控制前端路由、不需要大型集中狀態的管理,那麼你只需要載入 Vue.js 核心就夠。 ![](https://i.imgur.com/Psb5QhD.png) --- ## 參考資料 * [重新認識 Vue.js | Kuro Hsu](https://book.vue.tw/CH1/1-1-introduction.html)

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