在鸿蒙应用开发中，需要一个跳转系统邮件，发送邮件的demo

// Copyright (c) 2024-2025 IsOneHeart SourHarbor - PixelArtisan
export function startEmailAbility(context: common.UIAbilityContext, uri?: string) {
  context.startAbility({
    action: 'ohos.want.action.sendToData',
    uri: uri ? uri : 'mailto:example@example.com?subject=【像素匠反馈建议】'
  })
}

mail({ subject= '', recipients=[], body='', ccRecipients=[], bccRecipients=[] }: mainOptions, callback: Function) { 
  let mailUri: string = ''; 
  mailUri += recipients?.join(',') || ''; 
  mailUri += '?cc=' + ccRecipients?.join(',') || ''; 
  mailUri += '&bcc=' + bccRecipients?.join(',') || ''; 
  mailUri += '&subject=' + subject; 
  mailUri += '&body=' + body; 
  this.startEmailApp(mailUri, callback); 
}
startEmailApp = (mailUri, callback) => { 
  let want: Want = { 
    bundleName: 'com.huawei.hmos.email', 
    abilityName: 'EntryAbility', 
    moduleName: 'entry', 
    uri: 'mailto:' + mailUri, 
    action: 'ohos.want.action.viewData', 
  }; 
 
  try { 
    this.ctx.uiAbilityContext.startAbility(want) 
      .then(() => { 
        Logger.info(TAG, 'startAbility success'); 
      }) 
      .catch((err: BusinessError) => { 
        callback(err.message); 
      }) 
  } catch (e) { 
    callback(e); 
  } 
}