在我的登录屏幕上的 react-native 应用程序中，我正在努力在输入错误的用户名/密码组合后为用户提供漂亮的错误消息。为了与 API 交互，我使用了库 Axios。但是，当我在 catch 语句中遇到错误时，我收到一条丑陋的错误消息，说我有一个“未处理的 promise 拒绝”，我无法执行设置组件状态或导航到新的组件等操作页面。

我看不出我做错了什么，它看起来和我在文档中看到的例子一模一样。

在我的表单提交功能中，我有:

axios.post('http://192.168.1.11:1337/login', {
  email: this.state.username,
  password: this.state.password
}).then(function (response) {

  // This stuff all seems to work great
  console.log("The response we got: ", response);
  if (response.status == 200) {
    console.log("Status code equals 200");
    Actions.homepage();
  }
}).catch(function (err) {

  // Run into big problems when I get an error
  console.log("Got an error logging in, here's the message: ", err);
});

谁能看出我在这里做错了什么？

P.S. 这是我从服务器返回的错误消息，它是从 console.log("Got an error logging in, here's the message: ",错误)；:

"Got an error logging in, here's the message:"

{ [Error: Request failed with status code 401]
  config: 
   { transformRequest: { '0': [Function: transformRequest] },
     transformResponse: { '0': [Function: transformResponse] },
     headers: 
      { Accept: 'application/json, text/plain, */*',
       'Content-Type': 'application/json;charset=utf-8' },
    timeout: 0,
    xsrfCookieName: 'XSRF-TOKEN',
    xsrfHeaderName: 'X-XSRF-TOKEN',
    maxContentLength: -1,
    validateStatus: [Function: validateStatus],
    method: 'post',
    url: 'http://192.168.1.11:1337/login',
    data: '{"email":"zach@homies.io","password":"dddddd"}' },
  response: 
    { data: { message: 'Invalid password', user: false },
     status: 401,
     statusText: undefined,
     headers: 
     { map: 
        { connection: [ 'keep-alive' ],
          date: [ 'Thu, 31 Aug 2017 23:30:21 GMT' ],
          'x-powered-by': [ 'Sails <sailsjs.org>' ],
          vary: [ 'X-HTTP-Method-Override' ],
          'content-length': [ '52' ],
          'access-control-allow-credentials': [ '' ],
          'access-control-allow-origin': [ '' ],
          etag: [ 'W/"34-Ymi4isRxuJ6jE1EIS+AQag"' ],
          'access-control-allow-methods': [ '' ],
           'access-control-allow-headers': [ '' ],
           'access-control-expose-headers': [ '' ],
           'content-type': [ 'application/json; charset=utf-8' ] } },
     config: 
       { transformRequest: { '0': [Function: transformRequest] },
        transformResponse: { '0': [Function: transformResponse] },
        headers: 
         { Accept: 'application/json, text/plain, */*',
           'Content-Type': 'application/json;charset=utf-8' },
        timeout: 0,
        xsrfCookieName: 'XSRF-TOKEN',
        xsrfHeaderName: 'X-XSRF-TOKEN',
        maxContentLength: -1,
         validateStatus: [Function: validateStatus],
          method: 'post',
          url: 'http://192.168.1.11:1337/login',
          data: '{"email":"zach@homies.io","password":"dddddd"}' },
       request: 
        { url: 'http://192.168.1.11:1337/login',
          credentials: 'omit',
          headers: 
           { map: 
              { accept: [ 'application/json, text/plain, */*' ],
                'content-type': [ 'application/json;charset=utf-8' ] } },
          method: 'POST',
          mode: null,
          referrer: null,
          _bodyInit: '{"email":"zach@homies.io","password":"dddddd"}',
          _bodyText: '{"email":"zach@homies.io","password":"dddddd"}',
          bodyUsed: true } } }

这是它在 Android 模拟器(模拟三星 Galaxy S7)上的截图:

最佳答案

这段代码没有任何错误。

• 您发送请求。
• 您收到 401 - 未经授权的响应。
• Catch 接收到错误并记录下来。

有趣的是为什么您会收到未处理的 promise 拒绝错误。 但这被扔到别的地方了。所以你需要提供更多的代码。

编辑: 也许您只需要将 axios promise 返回给调用函数？

关于javascript - Axios Promise 处理 - 在 react-native 中获取 "Possible Unhandled Promise Rejection - TypeError: Network request failed"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45991384/