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                # computed ~~~ computed 計數 做一些復雜的操作 ~~~ 模板內的表達式非常便利,但是設計她們的初衷是用于簡單運算的。在模板中放入太多的邏輯會讓模板過眾難以維護 計算屬性是基于它們的響應式依賴進行緩存的。只在相關響應式依賴發生改變時他們才會重新求值。methods 不緩存 # 代碼: ~~~ <!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> </head> <body> <div id="app"> <p>{{count+1}}</p> <p>{{msg}}</p> <p>{{upMsg}}</p> </div> </body> </html> <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script> <script> var vue=new Vue({ el:'#app', data:{ msg:'hello vue', count:0 }, computed:{ //computed 計數 做一些復雜的操作 upMsg:function (){ return this.msg.toUpperCase()+'adsfsfsd'; //toUpperCase() 小寫轉大寫 } } }) ~~~ ![](https://img.kancloud.cn/fc/aa/fcaac991717964132fc4c16822ea1698_1099x602.png) ![](https://img.kancloud.cn/1d/1a/1d1a450e2fae6a6b555cb4309644b29c_1343x811.png)
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