循环遍历对象并返回特定属性的值

问题描述

我试图遍历一个对象并获取特定的属性值，但我只是获取键或值。这是我在做什么：

var fakeData = {
     "manufacturer": "tesla","cars": [
          {"title": "CALI","name": "CALI","type": "string" },{"title": "TEXAS","name": "TEXAS",{"title": "NY","name": "NY","type": "string" }
     ],"usedCars": [
          {"title": "FL","name": "FL",}

for (key in fakeData) {
 console.log(`${key}:${fakeData[key]}`)
}

我正在尝试获取汽车财产的所有权。我试过做 ${key.cars}:${fakeData[key.cars]} 但我没有定义。任何建议如何访问该属性？ TIA

解决方法

你的意思是这样吗？

var fakeData = {
     "manufacturer": "tesla","cars": [
          {"title": "CALI","name": "CALI","type": "string" },{"title": "TEXAS","name": "TEXAS",{"title": "NY","name": "NY","type": "string" }
     ],"usedCars": [
          {"title": "FL","name": "FL",],}

// using map
let carTitles = fakeData.cars.map(({title})=>title);

console.log(carTitles);

// using for loop

let carTitles2=[];
for ({title} of fakeData.cars)
  carTitles2.push(title);

console.log(carTitles2);
console.log('cars as string are:',carTitles2.join(','));

// both cars and usedCars using one loop
let cs  = '';
let ucs = '';
let clen=fakeData.cars.length;
let uclen=fakeData.usedCars.length;
let len=Math.max(clen,uclen);
for (let i=0;i<len;i++) {
   if (clen>0 && i<clen)
     cs = cs + (i ? ',' : '') + fakeData.cars[i].title;
   if (uclen>0 && i<uclen)
     ucs = ucs + (i ? ',' : '') + fakeData.usedCars[i].title;
}

console.log('cars are:',cs);
console.log('used cars are:',ucs);

,

这将遍历汽车对象并记录汽车标题。

var fakeData = {
     "manufacturer": "tesla",}

let result = ''

for (car of fakeData.cars) {  
  result += `The new cars are in ${car.title}\n`;
}

console.log(result);