Question

我有以下代码，该代码正在进行HTTP调用并返回promise

const res = simulations.getSimulationRunAssets({
  path: this.props.commonProps.apiPath,
  apiVersion: DEFAULT_API_VERSION,
  simulationRunId
});
console.log('**** res', res);

res
  .then(data => {
    console.log('2SimulationRun populateSimulationRun getsimulation run assets data', data);
    if (!data) {
      return Promise.reject(new Error('No data received from the API.'));
    }

控制台输出显示返回了prmoise：

**** res Promise {<pending>}
...
2SimulationRun populateSimulationRun getsimulation run assets data 
(3) [{…}, {…}, {…}]
0
:
{id: 1, name: "H..."}
...

但是随后我在控制台中得到以下信息：

Unhandled Rejection (TypeError): Cannot read property 'Symbol(Symbol.iterator)' of undefined

在下一行

右边（res.then（data => {）：

res
> 91 |   .then(data => {

getSimulationRunAssets：

const getSimulationRunAssets = ({ path, apiVersion, simulationRunId }) => {
  const urlPath = `${path}${apiVersion}/simulation-runs/${simulationRunId}/assets`;

  console.log('GET Simulation Run Assets API Call', `${urlPath}`);

  const promise = axios
    .get(urlPath)
    .then(res => {
      console.log('GET Simulation Run Assets Response', res);
      if (res.status !== 200) {
        const err = new Error('Error retrieving simulation run assets');
        err.response = res;
        throw err;
      }
      console.log('getSimulationRunAssets returning res.data', res.data);
      return res.data;
    })
    .catch(err => {
      console.error(err);
      if (err.response && err.response.data && err.response.data.message) {
        err = new verror.VError(err, err.response.data.message);
      }
      console.log('Rejecting');
      console.log('getSimulationRunAssets returning rejecting', err);
      return Promise.reject(err);
    });
  console.log('getSimulationRunAssets returning promise', promise);
  return promise;
};

Answer 1

Chrome中的错误不是很有帮助。当我切换到Firefox时，我可以看到该错误来自getSimulationRunAssets（）。 Firefox错误表示未定义arr。

[currentAsset] = data.name;

应该是：

currentAsset = data[0].name;

未处理的拒绝（TypeError）：无法读取未定义的属性'Symbol（Symbol.iterator）'

1 个答案: