我正在尝试制作一个使用 VueJS (2.x) 的客户端待办事项列表。这是我的 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>
然后在scripts/app.js 中我这样做了：
'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);
}
}
});
我的问题很简单：当我更改给定列表中复选框的状态（选中或取消选中它）时，紧随其后的复选框也会切换状态。
我不明白为什么会发生这种情况以及如何解决它。如果有人能告诉我为什么会发生这种情况（这样我就不必在 v-for/switch-state 行为不端时回到这里）以及如何修复它，那就太棒了！
data中最好使用Function，而不是Object，否则可能会导致更新错误。因为
Function仅在组件定义中使用时才被接受。// wrong data: { tasks: [] } // correct data() { return { task: [] } }compulated属性，该属性默认只有一个Compulated Getter。如果要处理compated属性，请给出计算设置器到它。// 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绑定值，因为 vue2 无法识别数组中的更改。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; } }); } } } });