我试图用Axios更好地理解javascript承诺。我假装处理request .js中的所有错误，并且只从任何地方调用请求函数，而不必使用catch()。
在本例中，对请求的响应将是400，并带有一个JSON格式的错误消息。
这是我得到的错误:
错误:请求失败，状态码为400
我找到的唯一解决方案是在Somewhere.js中添加.catch(() =>{})，但我试图避免这样做。这可能吗?
代码如下:
Request.js
export function request(method, uri, body, headers) {
let config = {
method: method.toLowerCase(),
url: uri,
baseURL: API_URL,
headers: { 'Authorization': 'Bearer ' + getToken() },
validateStatus: function (status) {
return status >= 200 && status < 400
}
}
...
return axios(config).then(
function (response) {
return response.data
}
).catch(
function (error) {
console.log('Show error notification!')
return Promise.reject(error)
}
)
}
Somewhere.js
export default class Somewhere extends React.Component {
...
callSomeRequest() {
request('DELETE', '/some/request').then(
() => {
console.log('Request successful!')
}
)
}
...
}
https://stackabuse.com/handling-errors-with-axios/
let res = await axios.get('/my-api-route');
// Work with the response...
} catch (err) {
if (err.response) {
// The client was given an error response (5xx, 4xx)
} else if (err.request) {
// The client never received a response, and the request was never left
} else {
// Anything else
}
}
try {
let res = await axios.get('/my-api-route');
// Work with the response...
} catch (err) {
if (err.response) {
// The client was given an error response (5xx, 4xx)
} else if (err.request) {
// The client never received a response, and the request was never left
console.log(err.request);
} else {
// Anything else
}
}
https://stackabuse.com/handling-errors-with-axios/
let res = await axios.get('/my-api-route');
// Work with the response...
} catch (err) {
if (err.response) {
// The client was given an error response (5xx, 4xx)
} else if (err.request) {
// The client never received a response, and the request was never left
} else {
// Anything else
}
}
try {
let res = await axios.get('/my-api-route');
// Work with the response...
} catch (err) {
if (err.response) {
// The client was given an error response (5xx, 4xx)
} else if (err.request) {
// The client never received a response, and the request was never left
console.log(err.request);
} else {
// Anything else
}
}
实际上，这在axios中是不可能实现的。仅在2xx范围内的状态代码可以在.then()中捕获。
一种传统的方法是在catch()块中捕获错误，如下所示:
axios.get('/api/xyz/abcd')
.catch(function (error) {
if (error.response) {
// Request made and server responded
console.log(error.response.data);
console.log(error.response.status);
console.log(error.response.headers);
} else if (error.request) {
// The request was made but no response was received
console.log(error.request);
} else {
// Something happened in setting up the request that triggered an Error
console.log('Error', error.message);
}
});
另一种方法是在请求或响应被处理或捕获之前拦截它们。
axios.interceptors.request.use(function (config) {
// Do something before request is sent
return config;
}, function (error) {
// Do something with request error
return Promise.reject(error);
});
// Add a response interceptor
axios.interceptors.response.use(function (response) {
// Do something with response data
return response;
}, function (error) {
// Do something with response error
return Promise.reject(error);
});
