1、准备对象数组
let cities = [
{ id: 1, chineseName: '合肥', englishName: 'Hefei', area: '11445.1 km²', population: '818.9 万'},
{ id: 2, chineseName: '南京', englishName: 'Nanjing', area: '6587.02 km²'},
];
2、添加属性
let findCity = cities.find(city => city.id === 2);
findCity['population'] = '850.0 万';
console.log(findCity);
3、删除属性
let findCity = cities.find(city => city.id === 1);
delete findCity.population;
console.log(findCity);
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