axios的配置项地址参考： https://www.npmjs.com/package/axios
{ // `url` is the server URL that will be used for the request
url: '/user', // `method` is the request method to be used when making the request
method: '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', and 'PATCH'
// 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 data
return data; }], // `transformResponse` allows changes to the response data to be made before
// it is passed to then/catch
transformResponse: [function (data) { // Do whatever you want to transform the data
return data; }], // `headers` are custom headers to be sent
headers: {'X-Requested-With': 'XMLHttpRequest'}, // `params` are the URL parameters to be sent with the request
// Must be a plain object or a URLSearchParams object
params: { ID: 12345 }, // `paramsSerializer` is an optional function in charge of serializing `params`
// (e.g. https://www.npmjs.com/package/qs, http://api.jquery.com/jquery.param/)
paramsSerializer: function(params) { return Qs.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 of one of the following types:
// - string, plain object, ArrayBuffer, ArrayBufferView, URLSearchParams
// - Browser only: FormData, File, Blob
// - Node only: Stream, Buffer
data: { 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 credentials
withCredentials: 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`.
auth: { username: 'janedoe', password: 's00pers3cret' }, // `responseType` indicates the type of data that the server will respond with
// options are 'arraybuffer', 'blob', 'document', 'json', 'text', 'stream'
responseType: 'json', // default
// `xsrfCookieName` is the name of the cookie to use as a value for xsrf token
xsrfCookieName: 'XSRF-TOKEN', // default
// `xsrfHeaderName` is the name of the http header that carries the xsrf token value
xsrfHeaderName: 'X-XSRF-TOKEN', // default
// `onUploadProgress` allows handling of progress events for uploads
onUploadProgress: function (progressEvent) { // Do whatever you want with the native progress event
}, // `onDownloadProgress` allows handling of progress events for downloads
onDownloadProgress: function (progressEvent) { // Do whatever you want with the native progress event
}, // `maxContentLength` defines the max size of the http response content allowed
maxContentLength: 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: 5, // default
// `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
// `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 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`.
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)
cancelToken: new CancelToken(function (cancel) { }) }
1、url（必写）
请求地址
2、method
请求方法，默认是get
3、baseURL（常用）
baseURL会添加到url前（url是绝对地址除外）。
4、transformRequest
`transformRequest`选项允许我们在请求发送到服务器之前对请求的数据做出一些改动
该选项只适用于以下请求方式：`put/post/patch`
5、transformResponse
`transformResponse`选项允许我们在数据传送到`then/catch`方法之前对数据进行改动
6、headers（常用，如设置请求头json类型）
自定义请求头信息
7、params（常用，只有get请求设置params，其他请求需设置params,即只有get的请求参数位于url后，其他请求参数都在请求体中）
`params`选项是要随请求一起发送的请求参数----一般链接在URL后面
8、data（常用）
`data`选项是作为一个请求体而需要被发送的数据，该选项只适用于方法：`put/post/patch`
在浏览器上data只能是FormData, File, Blob格式
9、timeout（常用）
超时时间
10、withCredentials
`withCredentails`选项表明了是否是跨域请求、默认是default
11、onUploadProgress
`onUploadProgress`上传进度事件
12、onDownloadProgress
下载进度的事件
13、maxContentLength
相应内容的最大值