这次给大家带来axios怎样基于promise的http请求客户端，axios基于promise的http请求客户端的注意事项有哪些，下面就是实战案例，一起来看一下。
axios
基于 Promise 的 HTTP 请求客户端，可同时在浏览器和 node.js 中使用
功能特性
在浏览器中发送XMLHttpRequests请求
在 node.js 中发送http请求
支持PromiseAPI
拦截请求和响应
转换请求和响应数据
自动转换 JSON 数据
客户端支持保护安全免受XSRF攻击
浏览器支持
安装
使用 bower:
$ bower install axios
使用 npm:
$ npm install axios
例子
发送一个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(response){console.log(response);});// Optionally the request above could also be done asaxios.get('/user',{params:{ID:12345}}).then(function(response){console.log(response);}).catch(function(response){console.log(response);});
发送一个POST请求
axios.post('/user',{firstName:'Fred',lastName:'Flintstone'}).then(function(response){console.log(response);}).catch(function(response){console.log(response);});
发送多个并发请求
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
可以通过给axios传递对应的参数来定制请求：
axios(config)// Send a POST requestaxios({method:'post',url:'/user/12345',data:{firstName:'Fred',lastName:'Flintstone'}});axios(url[, config])// Sned a GET request (default method)axios('/user/12345');
请求方法别名
为方便起见，我们为所有支持的请求方法都提供了别名
axios.get(url[, config])axios.delete(url[, config])axios.head(url[, config])axios.post(url[, data[, config]])axios.put(url[, data[, config]])axios.patch(url[, data[, config]])
注意
当使用别名方法时，url、method和data属性不需要在 config 参数里面指定。
并发
处理并发请求的帮助方法
axios.all(iterable)axios.spread(callback)
创建一个实例
你可以用自定义配置创建一个新的 axios 实例。
axios.create([config])varinstance=axios.create({baseURL:'https://some-domain.com/api/',timeout:1000,headers:{'X-Custom-Header':'foobar'}});
实例方法
所有可用的实例方法都列在下面了，指定的配置将会和该实例的配置合并。
axios#request(config)axios#get(url[, config])axios#delete(url[, config])axios#head(url[, config])axios#post(url[, data[, config]])axios#put(url[, data[, config]])axios#patch(url[, data[, config]])
请求配置
下面是可用的请求配置项，只有url是必需的。如果没有指定method，默认的请求方法是GET。
{// `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:' // `transformRequest` allows changes to the request data before it is sent to the server// This is only applicable for request methods 'PUT', 'POST', and 'PATCH'// The last function in the array must return a string or an ArrayBuffertransformRequest:[function(data){// Do whatever you want to transform the datareturndata;}],// `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 datareturndata;}],// `headers` are custom headers to be sentheaders:{'X-Requested-With':'XMLHttpRequest'},// `params` are the URL parameters to be sent with the requestparams:{ID:12345},// `paramsSerializer` is an optional function in charge of serializing `params`// (e.g. https://www.npmjs.com/package/qs, paramsSerializer:function(params){returnQs.stringify(params,{arrayFormat:'brackets'})},// `data` is the data to be sent as the request body// Only applicable for request methods 'PUT', 'POST', and 'PATCH'// When no `transformRequest` is set, must be a string, an ArrayBuffer or a hashdata:{firstName:'Fred'},// `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,// `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.// Call `resolve` or `reject` and supply a valid response (see [response docs](#response-api)).adapter:function(resolve,reject,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'}// `responseType` indicates the type of data that the server will respond with// options are 'arraybuffer', 'blob', 'document', 'json', 'text'responseType:'json',// 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// `progress` allows handling of progress events for 'POST' and 'PUT uploads'// as well as 'GET' downloadsprogress:function(progressEvent){// Do whatever you want with the native progress event}}
响应的数据结构
响应的数据包括下面的信息：
{// `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 headers that the server responded withheaders:{},// `config` is the config that was provided to `axios` for the requestconfig:{}}
当使用then或者catch时, 你会收到下面的响应：
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
你可以为每一个请求指定默认配置。
全局 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';
自定义实例默认配置
// Set config defaults when creating the instancevarinstance=axios.create({baseURL:' // Alter defaults after instance has been createdinstance.defaults.headers.common['Authorization']=AUTH_TOKEN;
配置的优先顺序
Config will be merged with an order of precedence. The order is library defaults found inlib/defaults.js, thendefaultsproperty of the instance, and finallyconfigargument for the request. The latter will take precedence over the former. Here's an example.// Create an instance using the config defaults provided by the library// At this point the timeout config value is `0` as is the default for the libraryvarinstance=axios.create();// Override timeout default for the library// Now all requests will wait 2.5 seconds before timing outinstance.defaults.timeout=2500;// Override timeout for this request as it's known to take a long timeinstance.get('/longRequest',{timeout:5000});
拦截器
你可以在处理then或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);});
移除一个拦截器：
varmyInterceptor=axios.interceptors.request.use(function(){/*...*/});axios.interceptors.request.eject(myInterceptor);
你可以给一个自定义的 axios 实例添加拦截器：
varinstance=axios.create();instance.interceptors.request.use(function(){/*...*/});错误处理axios.get('/user/12345').catch(function(response){if(responseinstanceofError){// Something happened in setting up the request that triggered an Errorconsole.log('Error',response.message);}else{// The request was made, but the server responded with a status code// that falls out of the range of 2xxconsole.log(response.data);console.log(response.status);console.log(response.headers);console.log(response.config);}});Promisesaxios 依赖一个原生的 ES6 Promise 实现，如果你的浏览器环境不支持 ES6 Promises，你需要引入polyfillTypeScriptaxios 包含一个TypeScript定义/// import*asaxiosfrom'axios';axios.get('/user?ID=12345');Creditsaxios 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.LicenseMIT
相信看了本文案例你已经掌握了方法，更多精彩请关注创想鸟其它相关文章！
相关阅读：
VUE如何使用anmate.css
css的渐变颜色
好用的404组件
解决Iview在vue-cli架子中字体图标丢失的方法
以上就是axios怎样基于Promise的HTTP请求客户端的详细内容，更多请关注创想鸟其它相关文章！
版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。
如发现本站有涉嫌抄袭侵权/违法违规的内容， 请发送邮件至 chuangxiangniao@163.com 举报，一经查实，本站将立刻删除。
发布者：程序猿，转转请注明出处：https://www.chuangxiangniao.com/p/1609071.html
微信扫一扫 
支付宝扫一扫 
