如何通过fetchCookieSync获取Web隐私模式下指定url对应cookie的值

import web_webview from '@ohos.web.webview';
import business_error from '@ohos.base';

try {
  // fetchCookieSync第二个参数表示获取隐私模式（true）或非隐私模式（false）下，webview的内存cookies。
  let value = web_webview.WebCookieManager.fetchCookieSync('https://www.example.com', true);
  console.log("fetchCookieSync cookie = " + value);
} catch (error) {
  let e:business_error.BusinessError = error as business_error.BusinessError;
  console.error(`ErrorCode: ${e.code},  Message: ${e.message}`);
}