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javascript - 从数组中获取特定值并将这些值转换为另一个数组

问题描述

我有一个如下所示的数组

[{
"title": "Apple iPhone 7 Plus 32 GB",
"category": "phone",
"brand": "apple",
"condition": "Used",
"price": 800,
"id": 0,
"description": "Apple"
}, {
    "title": "Apple Ipad Air 32 GB",
    "category": "tablet",

    "brand": "apple",
    "condition": "new",
    "price": 1000,
    "id": 1,
    "description": "Apple"
},{
    "title": "Supreme Box Logo Hooded Sweatshirt Navy",
    "category": "clothes",
    "brand": "Supreme",
    "condition": "new",
    "price": 1000,
    "id": 2,
    "description": "Supreme Size M"
},]

如何从上面的数组中只获取类别的值并将它们转换为这样的数组？

[{"phone","clothes","tablet"}]

标签： javascriptarraysjson

解决方案

只需映射您的数组并获取category每个数组。

也[{"phone","clothes","tablet"}]无效；一个对象是成对的键和值，所以我假设你的意思是["phone","clothes","tablet"]

const items = [{
"title": "Apple iPhone 7 Plus 32 GB",
"category": "phone",
"brand": "apple",
"condition": "Used",
"price": 800,
"id": 0,
"description": "Apple"
}, {
    "title": "Apple Ipad Air 32 GB",
    "category": "tablet",

    "brand": "apple",
    "condition": "new",
    "price": 1000,
    "id": 1,
    "description": "Apple"
},{
    "title": "Supreme Box Logo Hooded Sweatshirt Navy",
    "category": "clothes",
    "brand": "Supreme",
    "condition": "new",
    "price": 1000,
    "id": 2,
    "description": "Supreme Size M"
},];

const newItems = items.map(item => item.category);
console.log(newItems)

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