axios
基于promise用于浏览器和node.js的http客户端
特点
支持浏览器和node.js
支持promise
能拦截请求和响应
能转换请求和响应数据
能取消请求
自动转换JSON数据
浏览器端支持防止CSRF(跨站请求伪造)
安装
npm安装
$ npm install axios
bower安装
$ bower install axios
通过cdn引入
例子
发起一个GET请求
// Make a request for a user with a given IDaxios.get('/user?ID=12345') .then(function(response){console.log(response); }) .catch(function(error){console.log(error); });// Optionally the request above could also be done asaxios.get('/user', {params: {ID:12345} }) .then(function(response){console.log(response); }) .catch(function(error){console.log(error); });
发起一个POST请求
axios.post('/user', {firstName:'Fred',lastName:'Flintstone'}) .then(function(response){console.log(response); }) .catch(function(error){console.log(error); });
同时发起多个请求
functiongetUserAccount(){returnaxios.get('/user/12345');}functiongetUserPermissions(){returnaxios.get('/user/12345/permissions');}axios.all([getUserAccount(), getUserPermissions()]) .then(axios.spread(function(acct, perms){// Both requests are now complete}));
axios api
可以通过导入相关配置发起请求
axios(config)
// 发起一个POST请求axios({ method:'post', url:'/user/12345', data: { firstName:'Fred', lastName:'Flintstone'}});
// 获取远程图片axios({method:'get',url:'http://bit.ly/2mTM3nY',responseType:'stream'}) .then(function(response){ response.data.pipe(fs.createWriteStream('ada_lovelace.jpg'))});
axios(url[, config])
// 发起一个GET请求（GET是默认的请求方法）axios('/user/12345');
请求方法别名
为了方便我们为所有支持的请求方法均提供了别名。
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]])
注释
当使用以上别名方法时，url，method和data等属性不用在config重复声明。
同时发生的请求
一下两个用来处理同时发生多个请求的辅助函数
axios.all(iterable)
axios.spread(callback)
创建一个实例
你可以创建一个拥有通用配置的axios实例
axios.creat([config])
varinstance = axios.create({baseURL:'https://some-domain.com/api/',timeout:1000,headers: {'X-Custom-Header':'foobar'}});
实例的方法
以下是所有可用的实例方法，额外声明的配置将与实例配置合并
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]])
请求配置
下面是所有可用的请求配置项，只有url是必填，默认的请求方法是GET，如果没有指定请求方法的话。
{// `url` 是请求的接口地址url:'/user',// `method` 是请求的方法method:'get',// 默认值// 如果url不是绝对路径，那么会将baseURL和url拼接作为请求的接口地址// 用来区分不同环境，建议使用baseURL:'https://some-domain.com/api/',// 用于请求之前对请求数据进行操作// 只用当请求方法为‘PUT’，‘POST’和‘PATCH’时可用// 最后一个函数需return出相应数据// 可以修改headerstransformRequest: [function(data, headers){// 可以对data做任何操作returndata; }],// 用于对相应数据进行处理// 它会通过then或者catchtransformResponse: [function(data){// 可以对data做任何操作returndata; }],// `headers` are custom headers to be sentheaders: {'X-Requested-With':'XMLHttpRequest'},// URL参数// 必须是一个纯对象或者 URL参数对象params: {ID:12345},// 是一个可选的函数负责序列化`params`// (e.g. https://www.npmjs.com/package/qs, http://api.jquery.com/jquery.param/)paramsSerializer:function(params){returnQs.stringify(params, {arrayFormat:'brackets'}) },// 请求体数据// 只有当请求方法为'PUT', 'POST',和'PATCH'时可用// 当没有设置`transformRequest`时，必须是以下几种格式// - string, plain object, ArrayBuffer, ArrayBufferView, URLSearchParams// - Browser only: FormData, File, Blob// - Node only: Stream, Bufferdata: {firstName:'Fred'},// 请求超时时间（毫秒）timeout:1000,// 是否携带cookie信息withCredentials:false,// default// 统一处理request让测试更加容易// 返回一个promise并提供一个可用的response// 其实我并不知道这个是干嘛的！！！！// (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`.auth: {username:'janedoe',password:'s00pers3cret'},// 响应格式// 可选项 'arraybuffer', 'blob', 'document', 'json', 'text', 'stream'responseType:'json',// 默认值是json// `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// 处理上传进度事件onUploadProgress:function(progressEvent){// Do whatever you want with the native progress event},// 处理下载进度事件onDownloadProgress:function(progressEvent){// Do whatever you want with the native progress event},// 设置http响应内容的最大长度maxContentLength:2000,// 定义可获得的http响应状态码// return true、设置为null或者undefined，promise将resolved,否则将rejectedvalidateStatus:function(status){returnstatus >=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.// 最大重定向次数？没用过不清楚maxRedirects:5,// 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:newhttp.Agent({keepAlive:true}),httpsAgent:newhttps.Agent({keepAlive:true}),// 'proxy' defines the hostname and port of the proxy server// 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`.// 代理proxy: {host:'127.0.0.1',port: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)// 用于取消请求？又是一个不知道怎么用的配置项cancelToken:newCancelToken(function(cancel){ })}
响应组成
response由以下几部分信息组成
{// 服务端返回的数据data: {},// 服务端返回的状态码status:200,// 服务端返回的状态信息statusText:'OK',// 响应头// 所有的响应头名称都是小写headers: {},// axios请求配置config: {},// 请求request: {}}
用then接收以下响应信息
axios.get('/user/12345') .then(function(response){console.log(response.data);console.log(response.status);console.log(response.statusText);console.log(response.headers);console.log(response.config); });
默认配置
全局修改axios默认配置
axios.defaults.baseURL ='https://api.example.com';axios.defaults.headers.common['Authorization'] = AUTH_TOKEN;axios.defaults.headers.post['Content-Type'] ='application/x-www-form-urlencoded';
实例默认配置
// 创建实例时修改配置varinstance = axios.create({baseURL:'https://api.example.com'});// 实例创建之后修改配置instance.defaults.headers.common['Authorization'] = AUTH_TOKEN;
配置优先级
配置项通过一定的规则合并，request config>instance.defaults>系统默认，优先级高的覆盖优先级低的。
// 创建一个实例，这时的超时时间为系统默认的 0varinstance = axios.create();// 通过instance.defaults重新设置超时时间为2.5s，因为优先级比系统默认高instance.defaults.timeout =2500;// 通过request config重新设置超时时间为5s，因为优先级比instance.defaults和系统默认都高instance.get('/longRequest', {timeout:5000});
拦截器
你可以在then和catch之前拦截请求和响应。
// 添加一个请求拦截器axios.interceptors.request.use(function(config){// Do something before request is sentreturnconfig; },function(error){// Do something with request errorreturnPromise.reject(error); });// 添加一个响应拦截器axios.interceptors.response.use(function(response){// Do something with response datareturnresponse; },function(error){// Do something with response errorreturnPromise.reject(error); });
如果之后想移除拦截器你可以这么做
varmyInterceptor = axios.interceptors.request.use(function(){/*...*/});axios.interceptors.request.eject(myInterceptor);
你也可以为axios实例添加一个拦截器
varinstance = axios.create();instance.interceptors.request.use(function(){/*...*/});
错误处理
axios.get('/user/12345') .catch(function(error){if(error.response) {// 发送请求后，服务端返回的响应码不是 2xx console.log(error.response.data);console.log(error.response.status);console.log(error.response.headers); }elseif(error.request) {// 发送请求但是没有响应返回console.log(error.request); }else{// 其他错误console.log('Error', error.message); }console.log(error.config); });
你可以用validateStatus定义一个http状态码返回的范围.
axios.get('/user/12345', {validateStatus:function(status){returnstatus <500;// Reject only if the status code is greater than or equal to 500}})
取消请求
你可以通过cancel token来取消一个请求
The axios cancel token API is based on the withdrawncancelable promises proposal.
You can create a cancel token using theCancelToken.sourcefactory as shown below:
varCancelToken = axios.CancelToken;varsource = CancelToken.source();axios.get('/user/12345', {cancelToken: source.token}).catch(function(thrown){if(axios.isCancel(thrown)) {console.log('Request canceled', thrown.message); }else{// handle error}});// cancel the request (the message parameter is optional)source.cancel('Operation canceled by the user.');
You can also create a cancel token by passing an executor function to theCancelTokenconstructor:
varCancelToken = axios.CancelToken;varcancel;axios.get('/user/12345', {cancelToken:newCancelToken(functionexecutor(c){// An executor function receives a cancel function as a parametercancel = c; })});// cancel the requestcancel();
Note: you can cancel several requests with the same cancel token.
Using application/x-www-form-urlencoded format
By default, axios serializes JavaScript objects toJSON. To send data in theapplication/x-www-form-urlencodedformat instead, you can use one of the following options.
Browser
In a browser, you can use theURLSearchParamsAPI as follows:
varparams =newURLSearchParams();params.append('param1','value1');params.append('param2','value2');axios.post('/foo', params);
Note thatURLSearchParamsis not supported by all browsers (seecaniuse.com), but there is apolyfillavailable (make sure to polyfill the global environment).
Alternatively, you can encode data using theqslibrary:
varqs =require('qs');axios.post('/foo', qs.stringify({'bar':123}));
Node.js
In node.js, you can use thequerystringmodule as follows:
varquerystring =require('querystring');axios.post('http://something.com/', querystring.stringify({foo:'bar'}));
You can also use theqslibrary.
Semver
Until axios reaches a1.0release, breaking changes will be released with a new minor version. For example0.5.1, and0.5.4will have the same API, but0.6.0will have breaking changes.
Promises
axios depends on a native ES6 Promise implementation to besupported.
If your environment doesn't support ES6 Promises, you canpolyfill.
TypeScript
axios includesTypeScriptdefinitions.
importaxiosfrom'axios';axios.get('/user?ID=12345');
Resources
Credits
axios is heavily inspired by the$http serviceprovided inAngular. Ultimately axios is an effort to provide a standalone$http-like service for use outside of Angular.
License
MIT
作者：Lewis19990
链接：https://www.jianshu.com/p/7a9fbcbb1114
來源：简书
简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。
