javascript - 在 VUE js 中获取数组中数据的索引

Question

我想在调用特定方法时更改任务的状态。但问题是我无法获取数组特定项目的索引来更改其状态。 这是我的 HTML:

<div class="main" id="my-vue-app">
    <ul>
        <li v-for="task in completeTask">
            {{ task.description }} <button @click="markIncomplete">Mark as Incomplete</button>
        </li>

    </ul>
    <ul>
        <li v-for="task in incompleteTask">
            {{ task.description }} <button @click="markComplete">Mark as Complete</button>

        </li>
    </ul>
</div>

这是我的 Vue:

<script>
    new Vue(
        {
            el: '#my-vue-app',
            data:
            {
                tasks: [
                {description:'go to market', status: true},
                {description:'buy book', status: true}, 
                {description:'eat biriani', status: true}, 
                {description:'walk half kilo', status: false}, 
                {description:'eat icecream', status: false}, 
                {description:'return to home', status: false}
                ]
            },
            computed: 
            {
                incompleteTask()
                {
                    return this.tasks.filter(task => ! task.status);
                },
                completeTask()
                {
                    return this.tasks.filter(task => task.status);
                }
            },
            methods: 
            {
                markComplete()
                {
                    return this.task.status = true;

                },
                markIncomplete()
                {
                    return this.task.status = false;
                }
            }
        }
    )
</script>

我需要使用 markComplete() 和 markIncomplete() 但问题是我找不到获取当前元素索引的方法来更改它状态。

Answer 1

您可以通过 declaring a second argument at the v-for 获取索引:

<li v-for="(task, index) in incompleteTask">
    {{ task.description }} <button @click="markComplete(index)">Mark as Complete</button>
</li>

    methods: 
    {
        markComplete(index)
        {
            return this.tasks[index].status = true;

        },

但是，一个可能更简单的替代方法是简单地将 `task` 作为参数传递**:

<li v-for="task in incompleteTask">
    {{ task.description }} <button @click="markComplete(task)">Mark as Complete</button>
</li>

    methods: 
    {
        markComplete(task)
        {
            return task.status = true;

        },