axios使用

参考地址：https://github.com/axios/axios

html

CDN

<script src="https://cdn.jsdelivr.net/npm/axios@1.1.2/dist/axios.min.js"></script>或者 <script src="https://unpkg.com/axios@1.1.2/dist/axios.min.js"></script>

使用

<script src="https://cdn.jsdelivr.net/npm/axios@1.1.2/dist/axios.min.js"></script><script src="https://unpkg.com/axios/dist/axios.min.js"></script><script>
axios.get('/json/transform', {params: {ID: 12345}}).then(function (response) {console.log(response);$("#key_json").val(response.data);}).catch(function (error) {console.log(error);});axios.post('/json/transform/post', {firstName: 'Fred',lastName: 'Flintstone'
}).then(function (response) {console.log(response.data);}).catch(function (error) {console.log(error);});</script>

并发请求示例

function getUserAccount() {return axios.get('/user/12345');
}function getUserPermissions() {return axios.get('/user/12345/permissions');
}Promise.all([getUserAccount(), getUserPermissions()]).then(function (results) {const acct = results[0];const perm = results[1];});

通过配置请求

axios(config)

// Send a POST request
axios({method: 'post',url: '/user/12345',data: {firstName: 'Fred',lastName: 'Flintstone'}
});

// GET request for remote image in node.js
axios({method: 'get',url: 'https://bit.ly/2mTM3nY',responseType: 'stream'
})
.then(function (response) {
response.data.pipe(fs.createWriteStream('ada_lovelace.jpg'))
});

为所有常见的请求方法提供了别名

axios.request(config)
axios.get(url[, config])
axios.delete(url[, config])
axios.head(url[, config])
axios.options(url[, config])
axios.post(url[, data[, config]])
axios.put(url[, data[, config]])
axios.patch(url[, data[, config]])

当使用别名方法时，url、method和data属性不需要在配置中指定

Creating an instance

创建一个自定义的实例

const instance = axios.create({baseURL: 'https://some-domain.com/api/',timeout: 1000,headers: {'X-Custom-Header': 'foobar'}
});

全局配置

模式每个请求都会按此配置

axios.defaults.baseURL = 'https://api.example.com';// Important: If axios is used with multiple domains, the AUTH_TOKEN will be sent to all of them.
// See below for an example using Custom instance defaults instead.
axios.defaults.headers.common['Authorization'] = AUTH_TOKEN;axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';

个性配置

// Set config defaults when creating the instance
const instance = axios.create({baseURL: 'https://api.example.com'
});// Alter defaults after instance has been created
instance.defaults.headers.common['Authorization'] = AUTH_TOKEN;

请求配置参数

{// `url` is the server URL that will be used for the requesturl: '/user',// `method` is the request method to be used when making the requestmethod: 'get', // default// `baseURL` will be prepended to `url` unless `url` is absolute.// It can be convenient to set `baseURL` for an instance of axios to pass relative URLs// to methods of that instance.baseURL: 'https://some-domain.com/api/',// `transformRequest` allows changes to the request data before it is sent to the server// This is only applicable for request methods 'PUT', 'POST', 'PATCH' and 'DELETE'// The last function in the array must return a string or an instance of Buffer, ArrayBuffer,// FormData or Stream// You may modify the headers object.transformRequest: [function (data, headers) {// Do whatever you want to transform the datareturn data;}],// `transformResponse` allows changes to the response data to be made before// it is passed to then/catchtransformResponse: [function (data) {// Do whatever you want to transform the datareturn data;}],// `headers` are custom headers to be sentheaders: {'X-Requested-With': 'XMLHttpRequest'},// `params` are the URL parameters to be sent with the request// Must be a plain object or a URLSearchParams objectparams: {ID: 12345},// `paramsSerializer` is an optional config in charge of serializing `params`paramsSerializer: {encode?: (param: string): string => { /* Do custom ops here and return transformed string */ }, // custom encoder function; sends Key/Values in an iterative fashionserialize?: (params: Record<string, any>, options?: ParamsSerializerOptions ), // mimic pre 1.x behavior and send entire params object to a custom serializer func. Allows consumer to control how params are serialized.indexes: false // array indexes format (null - no brackets, false (default) - empty brackets, true - brackets with indexes)},// `data` is the data to be sent as the request body// Only applicable for request methods 'PUT', 'POST', 'DELETE , and 'PATCH'// When no `transformRequest` is set, must be of one of the following types:// - string, plain object, ArrayBuffer, ArrayBufferView, URLSearchParams// - Browser only: FormData, File, Blob// - Node only: Stream, Buffer, FormData (form-data package)data: {firstName: 'Fred'},// syntax alternative to send data into the body// method post// only the value is sent, not the keydata: 'Country=Brasil&City=Belo Horizonte',// `timeout` specifies the number of milliseconds before the request times out.// If the request takes longer than `timeout`, the request will be aborted.timeout: 1000, // default is `0` (no timeout)// `withCredentials` indicates whether or not cross-site Access-Control requests// should be made using credentialswithCredentials: false, // default// `adapter` allows custom handling of requests which makes testing easier.// Return a promise and supply a valid response (see lib/adapters/README.md).adapter: function (config) {/* ... */},// `auth` indicates that HTTP Basic auth should be used, and supplies credentials.// This will set an `Authorization` header, overwriting any existing// `Authorization` custom headers you have set using `headers`.// Please note that only HTTP Basic auth is configurable through this parameter.// For Bearer tokens and such, use `Authorization` custom headers instead.auth: {username: 'janedoe',password: 's00pers3cret'},// `responseType` indicates the type of data that the server will respond with// options are: 'arraybuffer', 'document', 'json', 'text', 'stream'//   browser only: 'blob'responseType: 'json', // default// `responseEncoding` indicates encoding to use for decoding responses (Node.js only)// Note: Ignored for `responseType` of 'stream' or client-side requestsresponseEncoding: 'utf8', // default// `xsrfCookieName` is the name of the cookie to use as a value for xsrf tokenxsrfCookieName: 'XSRF-TOKEN', // default// `xsrfHeaderName` is the name of the http header that carries the xsrf token valuexsrfHeaderName: 'X-XSRF-TOKEN', // default// `onUploadProgress` allows handling of progress events for uploads// browser & node.jsonUploadProgress: function ({loaded, total, progress, bytes, estimated, rate, upload = true}) {// Do whatever you want with the Axios progress event},// `onDownloadProgress` allows handling of progress events for downloads// browser & node.jsonDownloadProgress: function ({loaded, total, progress, bytes, estimated, rate, download = true}) {// Do whatever you want with the Axios progress event},// `maxContentLength` defines the max size of the http response content in bytes allowed in node.jsmaxContentLength: 2000,// `maxBodyLength` (Node only option) defines the max size of the http request content in bytes allowedmaxBodyLength: 2000,// `validateStatus` defines whether to resolve or reject the promise for a given// HTTP response status code. If `validateStatus` returns `true` (or is set to `null`// or `undefined`), the promise will be resolved; otherwise, the promise will be// rejected.validateStatus: function (status) {return status >= 200 && status < 300; // default},// `maxRedirects` defines the maximum number of redirects to follow in node.js.// If set to 0, no redirects will be followed.maxRedirects: 21, // default// `beforeRedirect` defines a function that will be called before redirect.// Use this to adjust the request options upon redirecting,// to inspect the latest response headers,// or to cancel the request by throwing an error// If maxRedirects is set to 0, `beforeRedirect` is not used.beforeRedirect: (options, { headers }) => {if (options.hostname === "example.com") {options.auth = "user:password";}},// `socketPath` defines a UNIX Socket to be used in node.js.// e.g. '/var/run/docker.sock' to send requests to the docker daemon.// Only either `socketPath` or `proxy` can be specified.// If both are specified, `socketPath` is used.socketPath: null, // default// `transport` determines the transport method that will be used to make the request. If defined, it will be used. Otherwise, if `maxRedirects` is 0, the default `http` or `https` library will be used, depending on the protocol specified in `protocol`. Otherwise, the `httpFollow` or `httpsFollow` library will be used, again depending on the protocol, which can handle redirects.transport: undefined, // default// `httpAgent` and `httpsAgent` define a custom agent to be used when performing http// and https requests, respectively, in node.js. This allows options to be added like// `keepAlive` that are not enabled by default.httpAgent: new http.Agent({ keepAlive: true }),httpsAgent: new https.Agent({ keepAlive: true }),// `proxy` defines the hostname, port, and protocol of the proxy server.// You can also define your proxy using the conventional `http_proxy` and// `https_proxy` environment variables. If you are using environment variables// for your proxy configuration, you can also define a `no_proxy` environment// variable as a comma-separated list of domains that should not be proxied.// Use `false` to disable proxies, ignoring environment variables.// `auth` indicates that HTTP Basic auth should be used to connect to the proxy, and// supplies credentials.// This will set an `Proxy-Authorization` header, overwriting any existing// `Proxy-Authorization` custom headers you have set using `headers`.// If the proxy server uses HTTPS, then you must set the protocol to `https`.proxy: {protocol: 'https',host: '127.0.0.1',// hostname: '127.0.0.1' // Takes precedence over 'host' if both are definedport: 9000,auth: {username: 'mikeymike',password: 'rapunz3l'}},// `cancelToken` specifies a cancel token that can be used to cancel the request// (see Cancellation section below for details)cancelToken: new CancelToken(function (cancel) {}),// an alternative way to cancel Axios requests using AbortControllersignal: new AbortController().signal,// `decompress` indicates whether or not the response body should be decompressed// automatically. If set to `true` will also remove the 'content-encoding' header// from the responses objects of all decompressed responses// - Node only (XHR cannot turn off decompression)decompress: true // default// `insecureHTTPParser` boolean.// Indicates where to use an insecure HTTP parser that accepts invalid HTTP headers.// This may allow interoperability with non-conformant HTTP implementations.// Using the insecure parser should be avoided.// see options https://nodejs.org/dist/latest-v12.x/docs/api/http.html#http_http_request_url_options_callback// see also https://nodejs.org/en/blog/vulnerability/february-2020-security-releases/#strict-http-header-parsing-noneinsecureHTTPParser: undefined // default// transitional options for backward compatibility that may be removed in the newer versionstransitional: {// silent JSON parsing mode// `true`  - ignore JSON parsing errors and set response.data to null if parsing failed (old behaviour)// `false` - throw SyntaxError if JSON parsing failed (Note: responseType must be set to 'json')silentJSONParsing: true, // default value for the current Axios version// try to parse the response string as JSON even if `responseType` is not 'json'forcedJSONParsing: true,// throw ETIMEDOUT error instead of generic ECONNABORTED on request timeoutsclarifyTimeoutError: false,},env: {// The FormData class to be used to automatically serialize the payload into a FormData objectFormData: window?.FormData || global?.FormData},formSerializer: {visitor: (value, key, path, helpers) => {}; // custom visitor function to serialize form valuesdots: boolean; // use dots instead of brackets formatmetaTokens: boolean; // keep special endings like {} in parameter keyindexes: boolean; // array indexes format null - no brackets, false - empty brackets, true - brackets with indexes},// http adapter only (node.js)maxRate: [100 * 1024, // 100KB/s upload limit,100 * 1024  // 100KB/s download limit]
}
Response Schema
The response for a request contains the following information.{// `data` is the response that was provided by the serverdata: {},// `status` is the HTTP status code from the server responsestatus: 200,// `statusText` is the HTTP status message from the server responsestatusText: 'OK',// `headers` the HTTP headers that the server responded with// All header names are lowercase and can be accessed using the bracket notation.// Example: `response.headers['content-type']`headers: {},// `config` is the config that was provided to `axios` for the requestconfig: {},// `request` is the request that generated this response// It is the last ClientRequest instance in node.js (in redirects)// and an XMLHttpRequest instance in the browserrequest: {}
}

响应参数

{// `data` is the response that was provided by the serverdata: {},// `status` is the HTTP status code from the server responsestatus: 200,// `statusText` is the HTTP status message from the server responsestatusText: 'OK',// `headers` the HTTP headers that the server responded with// All header names are lowercase and can be accessed using the bracket notation.// Example: `response.headers['content-type']`headers: {},// `config` is the config that was provided to `axios` for the requestconfig: {},// `request` is the request that generated this response// It is the last ClientRequest instance in node.js (in redirects)// and an XMLHttpRequest instance in the browserrequest: {}
}

拦截器

配置请求拦截器和响应拦截器（默认异步添加）

个性

const instance = axios.create();
instance.interceptors.request.use(function () {/*...*/});

全局

// Add a request interceptor
axios.interceptors.request.use(function (config) {// Do something before request is sentconfig.headers.test = 'I am only a header!';return config;}, function (error) {// Do something with request errorreturn Promise.reject(error);});// Add a response interceptor
axios.interceptors.response.use(function (response) {// Any status code that lie within the range of 2xx cause this function to trigger// Do something with response datareturn response;}, function (error) {// Any status codes that falls outside the range of 2xx cause this function to trigger// Do something with response errorreturn Promise.reject(error);});

同步方式添加拦截器

axios.interceptors.request.use(function (config) {config.headers.test = 'I am only a header!';return config;
}, null, { synchronous: true });

根据条件添加拦截器

function onGetCall(config) {return config.method === 'get';
}
axios.interceptors.request.use(function (config) {config.headers.test = 'special get headers';return config;
}, null, { runWhen: onGetCall });

删除拦截器

const myInterceptor = axios.interceptors.request.use(function () {/*...*/});
axios.interceptors.request.eject(myInterceptor);

清理拦截器

// Removes interceptors from requests
instance.interceptors.request.clear(); // Removes interceptors from responses
instance.interceptors.response.clear();

异常处理

默认情况下所有非 2xx 的返回，都认为是异常的

axios.get('/user/12345').catch(function (error) {if (error.response) {// The request was made and the server responded with a status code// that falls out of the range of 2xxconsole.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// `error.request` is an instance of XMLHttpRequest in the browser and an instance of// http.ClientRequest in node.jsconsole.log(error.request);} else {// Something happened in setting up the request that triggered an Errorconsole.log('Error', error.message);}console.log(error.config);});

定义应该抛出错误的HTTP代码，默认是 (status >= 200 && status < 300)

 
axios.get('/user/12345', {validateStatus: function (status) {return status < 500; // Resolve only if the status code is less than 500}
})

中断请求

const controller = new AbortController();axios.get('/foo/bar', {signal: controller.signal
}).then(function(response) {//...
});
// cancel the request
controller.abort() 

使用 application/x-www-form-urlencoded 格式

axios 默认是json 格式提交数据，如果要使用表单格式（application/x-www-form-urlencoded），有以下2中方式：

• 1、URLSearchParams

const params = new URLSearchParams({ foo: 'bar' });
params.append('extraparam', 'value');
axios.post('/foo', params);

• 2、 qs

const qs = require('qs');
axios.post('/foo', qs.stringify({ 'bar': 123 }));

或者

import qs from 'qs';
const data = { 'bar': 123 };axios({method: 'POST',headers: { 'content-type': 'application/x-www-form-urlencoded' },data: qs.stringify(data),url,
});

若果数据头 content-type 设置为 “application/x-www-form-urlencoded” ，axios自动用表单方式提交数据

const data = {x: 1,arr: [1, 2, 3],arr2: [1, [2], 3],users: [{name: 'Peter', surname: 'Griffin'}, {name: 'Thomas', surname: 'Anderson'}],
};await axios.postForm('https://postman-echo.com/post', data,{headers: {'content-type': 'application/x-www-form-urlencoded'}}
);

数据将变成

  {x: '1','arr[]': [ '1', '2', '3' ],'arr2[0]': '1','arr2[1][0]': '2','arr2[2]': '3','arr3[]': [ '1', '2', '3' ],'users[0][name]': 'Peter','users[0][surname]': 'griffin','users[1][name]': 'Thomas','users[1][surname]': 'Anderson'}

使用 multipart/form-data 格式

FormData
使用 multipart/formdata 格式，需要用 FormData 对象做载体，axios 会自动设置headers: {‘content-type’: ‘multipart/form-data’}

const formData = new FormData();
formData.append('foo', 'bar');axios.post('https://httpbin.org/post', formData);

或者

axios.post('https://httpbin.org/post', {x: 1}, {headers: {'Content-Type': 'multipart/form-data'}
}).then(({data}) => console.log(data));

文件发送

提交单个文件

await axios.postForm('https://httpbin.org/post', {'myVar' : 'foo','file': document.querySelector('#fileInput').files[0]
});

使用 multipart/form-data 格式提交多个文件

await axios.postForm('https://httpbin.org/post', {'files[]': document.querySelector('#fileInput').files
});

或者

await axios.postForm('https://httpbin.org/post', document.querySelector('#fileInput').files)

速率限制

Download and upload rate limits can only be set for the http adapter (node.js):

const {data} = await axios.post(LOCAL_SERVER_URL, myBuffer, {onUploadProgress: ({progress, rate}) => {console.log(`Upload [${(progress*100).toFixed(2)}%]: ${(rate / 1024).toFixed(2)}KB/s`)},maxRate: [100 * 1024], // 100KB/s limit
});