我正在嘗試製作一個使用 VueJS (2.x) 的客戶端待辦事項清單。這是我的 HTML：
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>To-do List</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-Zenh87qX5JnK2Jl0vWa8Ck2rdkQ2Bzep5IDxbcnCeuOxjzrPF/et3URy9Bv1WTRi" crossorigin="anonymous">
</head>
<body>
<div id="app">
<h1>To-do List</h1>
<h2>Completed Tasks!</h2>
<ul>
<li v-for="item in complete">{{ item.description }}<input type="checkbox" :checked="item.done" @change="item.done = false"></li>
</ul>
<h2>Uncompleted Tasks!</h2>
<ul>
<li v-for="item in uncomplete">{{ item.description }}<input type="checkbox" :checked="item.done" @change="item.done = true"></li>
</ul>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2.7.13/dist/vue.js"></script>
<script type="module" src="scripts/app.js"></script>
</body>
</html>
然後在scripts/app.js 中我這麼做了：
'use strict'
let app = new Vue({
el : "#app",
data : {
tasks: [
{ description: 'Say Hello', done: true },
{ description: 'Review Code', done: false },
{ description: 'Read Emails', done: false },
{ description: 'Reply to Emails', done: false },
{ description: 'Wash The Dishes', done: true },
{ description: 'Stop Working', done: true },
]
},
computed : {
complete : function() {
return this.tasks.filter(task => task.done === true);
},
uncomplete : function() {
return this.tasks.filter(task => task.done === false);
}
}
});
我的問題很簡單：當我更改給定清單中複選框的狀態（選中或取消選中它）時，緊接在後的複選框也會切換狀態。
我不明白為什麼會發生這種情況以及如何解決它。如果有人能告訴我為什麼會發生這種情況（這樣我就不必在 v-for/switch-state 行為不端時回到這裡）以及如何修復它，那就太棒了！
data中最好使用Function，而不是Object，否則可能會導致更新錯誤。因為
Function僅在元件定義中使用時才被接受。// wrong data: { tasks: [] } // correct data() { return { task: [] } }compulated屬性，該屬性預設只有一個Compulated Getter。如果要處理compated屬性，請給出計算設定器到它。// wrong computed: { complete(){ return this.tasks.filter(task => task.done === true); }, } // right computed: { complete: { get() { return this.tasks.filter(task => task.done === true); }, set(value) { this.task.forEach((task, index) => { let matched = value.find(({ description }) => description === task.description); if(matched) { this.task[index] = matched; } }); } } }v-for綁定值，因為 vue2 無法辨識陣列中的變更。new Vue({ el: "#app", data() { return { tasks: [ { description: 'Say Hello', done: true }, { description: 'Review Code', done: false }, { description: 'Read Emails', done: false }, { description: 'Reply to Emails', done: false }, { description: 'Wash The Dishes', done: true }, { description: 'Stop Working', done: true }, ] }; }, computed : { complete: { get() { return this.tasks.filter(task => task.done === true); }, set(value) { this.task.forEach((task, index) => { let matched = value.find(({ description }) => description === task.description); if(matched) { this.task[index] = matched; } }); } }, uncomplete: { get() { return this.tasks.filter(task => task.done === false); }, set(value) { this.task.forEach((task, index) => { let matched = value.find(({ description }) => description === task.description); if(matched) { this.task[index] = matched; } }); } } } });