React-Native post和get请求

post：

fetchData (title) {
    fetch(REQUEST_URL, {
    method: 'POST',
    headers: {
    'Accept': 'application/json',
    'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      email: un,
      password: pw
    })
  })
    .then((response) => response.json())
    .then((responseData) => {
      if (responseData['isOK']==='ok') {
        ToastAndroid.show('登录成功', ToastAndroid.SHORT)
      } else {
        ToastAndroid.show('登录失败', ToastAndroid.SHORT)
      }
    })
    .done()
  }

  responseData (response) {
    return response.result.data
  }

get：

fetchData: function () {
    fetch(REQUEST_URL)
      .then((response) => response.json())
      .then((responseData) => {
        this.setState({
          dataSource: this.state.dataSource.cloneWithRows(responseData),
          loaded: true
        })
      })
      .done()
  },