How vue.js traverses map

Vue.js method of traversing map: vue uses [v-for] to traverse Map, the code is [6fab9fed0ee924d0559946d206b7b31f】.

The operating environment of this tutorial: windows10 system, vue2.9, this article is applicable to all brands of computers.

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vue.js method of traversing map:

The object data is as follows:

"cities": {
"A": [{
"id": 56,
"spell": "aba",
"name": "阿坝"
}, {
"id": 57,
"spell": "akesu",
"name": "阿克苏"
}],
"B": [{
"id": 58,
"spell": "baiyin",
"name": "白银"
}, {
"id": 59,
"spell": "bangbu",
"name": "蚌埠"
}],
"C": [{
"id": 60,
"spell": "chengdu",
"name": "成都"
}, {
"id": 61,
"spell": "cangzhou",
"name": "沧州"
}]

The traversal method is as follows:

<div class="area" v-for="(item, key) of cities" :key="key">
                <div class="title border-topbottom">{{key}}</div>
                <div class="item-list">
                    <div class="item border-bottom" v-for="innerItem of item" :key="innerItem.id">{{innerItem.name}}</div>
                </div>
            </div>

The key is v-for="(item, key) of cities", which is equivalent to the Map structure(key, value)

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