HarmonyOS 鸿蒙Next http怎么解析返回的数据，并提取其中的token

import http from ‘@ohos.net.http’;
import { JSON } from ‘@kit.ArkTS’;

class Header {
public contentType: string;
constructor(contentType: string) {
this.contentType = contentType
}
}
let httpRequest = http.createHttp();   //创建http对象
let postOptions: http.HttpRequestOptions = {    //设置请求参数
method: http.RequestMethod.POST,    //设置请求方法
extraData: {               //设置请求体数据
username: ‘testUser’,
password: ‘000000’
},
expectDataType: http.HttpDataType.STRING,      //设置返回数据类型
header: {                                  //设置请求头
‘Content-Type’: ‘application/json’
},
readTimeout: 60000,            //设置超时时间
connectTimeout: 60000               //设置连接超时时间
}
@Entry
@Component
struct Index {
@State message: string = ‘Hello World’;
build() {
Row() {
Column() {
Text(this.message)
.fontSize(50)
.fontWeight(FontWeight.Bold)
Button(‘login’)
.onClick(() => {
httpRequest.request(‘localhost:8080/api/login’,postOptions,(err: Error, data: http.HttpResponse) => {
if (err) {
console.log(‘error:’ + err.message);
} else {
console.log(‘data:’ + data.result);
console.info(‘code:’ + data.responseCode);
console.info(‘type:’ + JSON.stringify(data.resultType));
console.info(‘header:’ + JSON.stringify(data.header));
            <span class="hljs-comment">//解析返回数据</span>
            

          }
        })
      })
  }
  .<span class="hljs-title function_">width</span>(<span class="hljs-string">'100%'</span>)
}
.<span class="hljs-title function_">height</span>(<span class="hljs-string">'100%'</span>)
}
}