在Node.js中，我們經(jīng)常需要訪問和操作JSON數(shù)據(jù)。egg.js提供了非常方便的操作JSON數(shù)據(jù)的方法，本文將介紹egg.js如何獲取JSON節(jié)點(diǎn)。

// 示例數(shù)據(jù)
const data = {
"name": "Tom",
"age": 18,
"address": {
"city": "Shanghai",
"district": "Pudong New Area"
},
"hobbies": ["reading", "swimming", "coding"]
}
// 獲取一級(jí)節(jié)點(diǎn)
const name = data.name;  // "Tom"
const age = data.age;    // 18
// 獲取二級(jí)節(jié)點(diǎn)
const city = data.address.city;         // "Shanghai"
const district = data.address.district; // "Pudong New Area"
// 獲取數(shù)組節(jié)點(diǎn)
const hobbies = data.hobbies;             // ["reading", "swimming", "coding"]
const firstHobby = data.hobbies[0];       // "reading"
const secondHobby = data.hobbies[1];      // "swimming"
const thirdHobby = data.hobbies[2];       // "coding"

可以看出，獲取JSON節(jié)點(diǎn)非常簡(jiǎn)單，只需要用“.”訪問節(jié)點(diǎn)即可。如果節(jié)點(diǎn)是數(shù)組，可以使用數(shù)組下標(biāo)訪問。在egg.js中，還提供了更多更靈活的操作JSON數(shù)據(jù)的方法，如JSON字符串轉(zhuǎn)JSON對(duì)象、JSON對(duì)象轉(zhuǎn)字符串等，可根據(jù)實(shí)際需求選擇使用。