在使用JSON數(shù)據(jù)時(shí)，我們通常需要獲取對(duì)象中每個(gè)數(shù)值。下面介紹幾種方式來(lái)實(shí)現(xiàn)這個(gè)目標(biāo)。

<code class='language-javascript'>// 假設(shè)有一個(gè)JSON對(duì)象
const obj = {
"name": "Tom",
"age": 18,
"address": {
"province": "Guangdong",
"city": "Shenzhen"
},
"scores": [80, 85, 90]
};

1. 通過(guò)點(diǎn)號(hào)或中括號(hào)方式獲取對(duì)象屬性值

<code class='language-javascript'>// 通過(guò)點(diǎn)號(hào)獲取
const name = obj.name;
const age = obj.age;
const province = obj.address.province;
const score1 = obj.scores[0];
// 通過(guò)中括號(hào)方式獲取
const name = obj['name'];
const age = obj['age'];
const province = obj['address']['province'];
const score1 = obj['scores'][0];

2. 使用解構(gòu)賦值方式獲取

<code class='language-javascript'>const {name, age, address: {province}, scores: [score1]} = obj;

3. 使用Object.keys()方法獲取所有鍵值

<code class='language-javascript'>const keys = Object.keys(obj);
// 輸出 ["name", "age", "address", "scores"]
keys.forEach((key) => {
const value = obj[key];
console.log(`${key}: ${value}`);
});

以上三種方式各有優(yōu)劣，具體選擇應(yīng)根據(jù)實(shí)際業(yè)務(wù)需求而定。