vue v-for动态循环select，并取其中的值,和值的分类

问题：
写 vue , for 循环的时候，遇到需要循环 select ，并进行取值

先上代码:
1:：json 代码：

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2： vue 代码：

<div class="effectCategory"><div v-for="(e, index) in effectArr" :key="index"><el-select v-model="effectChoose" :placeholder="e.name" @change="selectEffect"><el-option v-for="(item, index) in e.list" :key="index" :label="item.name" :value="item.name"></el-option></el-select></div>
</div>

3：运行结果

可以看到，取值是能取到自己的值，但是遍历选择的时候，并不是自己想要的结果，它们之间不应该相同才对

解决：

把中间的代码修改成：

<div class="effectCategory"><div v-for="(e, index) in effectArr" :key="index"><el-select v-model="e.name" :placeholder="e.name" @change="selectEffect(e.name)"><el-option v-for="(item, index) in e.list" :key="index" :label="item.name" :value="item.name"></el-option></el-select></div>
</div>

运行结果：

PS：以上得出的结果是我自己想要的结果。
还有另外一种是输出的时候，需要得出哪个分类的。

得出分类：
1：拿到数据的时候，重新分类一个类；

2：在 @change 事件中，把 index (下标) 传递回来即可

<div><el-select v-for="(e, index) in effectArr" :key="index" v-model="e.name" :placeholder="e.name" @change="selectEffect(e.name, index)"><el-option v-for="(item, index) in e.list" :key="index" :label="item.name" :value="item.name"></el-option></el-select>
</div>

3：打印代码和效果：

console.log(index, this.effectArrCopy[index])

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