如何解决如何获得物体的财产价值?
以下示例中的我的问题。我几乎在那里建立了一个新的对象数组并重命名了一些属性。但是那里只显示国家。其他属性是“未定义”。
我试图做这样的事情:name: t.cities[0].id,
但是此方法并未遍历以下对象,仅遍历第一个
预先感谢
let data = [
{
"country": "italy","cities": [
{
"id": "milan","count": "1366180",},{
"id": "rome","count": "2870500",{
"id": "torino","count": "870952",}
]
},{
"country": "france","cities": [
{
"id": "paris","count": "2148327",{
"id": "marseille","count": "869815",{
"id": "lyon","count": "516092",}
]
}
]
let rename = data.map( a => ({
country: a.country,cities: data.map( t => ({
name: t.cities.id,population: t.cities.count,}))
}));
console.log( rename )
解决方法
内部data.map()
应该是a.cities.map()
。并且此地图接收单个城市对象,您可以直接访问id
和count
属性,它们不需要是嵌套属性。
let data = [
{
"country": "italy","cities": [
{
"id": "milan","count": "1366180",},{
"id": "rome","count": "2870500",{
"id": "torino","count": "870952",}
]
},{
"country": "france","cities": [
{
"id": "paris","count": "2148327",{
"id": "marseille","count": "869815",{
"id": "lyon","count": "516092",}
]
}
]
let rename = data.map( a => ({
country: a.country,cities: a.cities.map( city => ({
name: city.id,population: city.count,}))
}));
console.log( rename )
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