Vue 2 - 变异道具vue-warn [英] Vue 2 - Mutating props vue-warn

问题描述

我开始 https://laracasts.com/series/learning-vue-一步一步系列。我在 Vue，Laravel和AJAX 课程上停止了这个错误：

I started https://laracasts.com/series/learning-vue-step-by-step series. I stopped on the lesson Vue, Laravel, and AJAX with this error:

vue.js:2574 [Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: "list" (found in component <task>)

我有这个代码 main.js

Vue.component('task', {
    template: '#task-template',
    props: ['list'],
    created() {
        this.list = JSON.parse(this.list);
    }
});
new Vue({
    el: '.container'
})

当我覆盖列表道具时，我知道问题出在 created（），但我是Vue的新手，所以我完全不知道如何解决它。任何人都知道如何（并请解释原因）来解决它？

I know that the problem is in created() when I overwrite the list prop, but I am a newbie in Vue, so I totally don't know how to fix it. Anyone have an idea how (and please explain why) to fix it?

推荐答案

这与 在本地改变道具被视为Vue 2中的反模式

如果您想在本地改变道具，您现在应该做的是在<$中声明一个字段c $ c> data 使用 props 值作为其初始值，然后改变副本：

What you should do now, in case you want to mutate a prop locally, is to declare a field in your data that uses the props value as its initial value and then mutate the copy:

Vue.component('task', {
    template: '#task-template',
    props: ['list'],
    data: function () {
        return {
            mutableList: JSON.parse(this.list);
        }
    }
});

您可以在 Vue.js官方指南

注1：请注意 你应该不为你的 prop使用相同的名称和数据 ，即：

Note 1: Please note that you should not use the same name for your prop and data, i.e.:

data: function () { return { list: JSON.parse(this.list) } // WRONG!!

注2：，因为我觉得有一些关于的混乱道具和反应性，我建议你看看这个主题

Note 2: Since I feel there is some confusion regarding props and reactivity, I suggest you to have a look on this thread

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