案例1

 运行代码如下

 上图的运行结果如下:

附加1 

Json_msg interface

案例2

import {JSON } from '@kit.ArkTS';
export interface commonRes {status: numberreturnJSON: ESObject;time: string
}
export interface returnRes {uid: stringuserType: number;
}@Entry
@Component
struct Index {@State message: string = 'Hello World';build() {RelativeContainer() {Text(this.message).id('HelloWorld').fontSize(50).fontWeight(FontWeight.Bold).onClick(async (event: ClickEvent) => {// 将该json 解析成对象let str = '{"returnJSON":{"uid":"02f17bc6b3fc465fab91d083844c7a29","userType":1,"createOn":"2024-07-12 16:38:18","thirdPartys":[],"info":{"cardNo":"AAA02342","radishQty":0},"showPage":false,"userMark":"old","isBlackNight":true,"installChannel":"Harmonyos","adChannel":"Harmonyos","showImg":"https://word.xxx.cn/tools/diary/UserDress/53c36b159ce84cf583db8f7d866cab40.png","IsDollOpen":true,"IsActivityOpen":true,"nickName":"匿名","level":1,"levelNick":"萌新","proType":0,"color":"#D2B7FF","PhotoFrameUrl":""},"status":1,"time":"2024-07-15 03:04:16"}'let str1 = '{"returnJSON":{"uid":"02f17bc6b3fc465fab91d083844c7a29","userType":1},"status":1,"time":"2024-07-15 03:04:16"}'let obj:commonRes = JSON.parse(str) as commonResconsole.log("----1-time--"+obj.time)//方案一 自定义returnRes类let res:returnRes = obj.returnJSONconsole.log("----1-uid-"+res.uid)//方案二 不定义returnRes类let res1:ESObject = JSON.parse(JSON.stringify(obj.returnJSON))console.log("----2-uid-"+res1["uid"])}).alignRules({center: { anchor: '__container__', align: VerticalAlign.Center },middle: { anchor: '__container__', align: HorizontalAlign.Center }})}.height('100%').width('100%')}
}

案例3

import { DataAbilityHelper } from '@ohos.data.ability';interface Person {name: string;age: number;city: string;
}@Component
struct JsonToEntity {async convertJsonToEntities(jsonString: string) : Person[] {let persons: Person[] = JSON.parse(jsonString) as Person[];return persons;}build() {Column() {let jsonString = `[{"name":"徐庆","age":31,"city":"湖北"},{"name":"宇智波斑","age":80,"city":"宇智波"},{"name":"万祐宁","age":30,"city":"湖北"},{"name":"千手柱间","age":79,"city":"木叶"},{"name":"我爱罗","age":28,"city":"沙影村"},{"name":"佩恩","age":34,"city":"雨影村"}]`;let persons: Person[] = JSON.parse(jsonString) as Person[]console.debug(`param is ` + persons[0].name);}}
}