This article brings you what is axios? Axios' detailed explanation (example) of secondary encapsulation based on business scenarios has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
axios is a promise-based HTTP library that can be used in browsers and node.js.
It is also widely used in front-end frameworks. Whether it is vue or react, there are many projects that use axios as the network request library.
I have used axios in several recent projects, and based on axios, I encapsulated a general request service based on common business scenarios.
Business scenario:
Global request configuration.
Promise encapsulation of get, post, put, delete and other requests.
Global request status management for loading animations, etc.
Route jump cancels the current page request.
Requests carry tokens and permission errors are managed uniformly.
Define the global default configuration
axios.defaults.timeout = 10000 //超时取消请求 axios.defaults.headers.post['Content-Type'] = 'application/json;charset=UTF-8' axios.defaults.baseURL = process.env.BASE_URL //挂载在process下的环境常量，
Customized configuration (uncommon business scenarios, only for introduction)
// 创建实例时设置配置的默认值
var instance = axios.create({
baseURL: 'https://api.another.com'
});
// 在实例已创建后修改默认值
instance.defaults.headers.common['Authorization'] = AUTH_TOKEN;Priority: Custom configuration> Default configuration
Request interceptor
// 请求列表
const requestList = []
axios.interceptors.request.use((config) => {
//1.将当前请求的URL添加进请求列表数组
requestList.push(config.url)
//2.请求开始，改变loading状态供加载动画使用
store.dispatch('changeGlobalState', {loading: true})
//3.从store中获取token并添加到请求头供后端作权限校验
const token = store.getters.userInfo.token
if (token) {
config.headers.token = token
}
return config
}, function (error) {
return Promise.reject(error)
})1. All requested urls are included in the request interceptor Add the request list variable to prepare for request cancellation and loading status management
2. Once the request starts, you can turn on the animation loading effect.
3. After logging in, the user can carry the token in the request header for permission verification and use
Response interceptor
axios.interceptors.response.use(function (response) {
// 1.将当前请求中请求列表中删除
requestList.splice(requestList.findIndex(item => item === response.config.url), 1)
// 2.当请求列表为空时，更改loading状态
if (requestList.length === 0) {
store.dispatch('changeGlobalState', {loading: false})
}
// 3.统一处理权限认证错误管理
if (response.data.code === 900401) {
window.ELEMENT.Message.error('认证失效，请重新登录！', 1000)
router.push('/login')
}
return response
}, function (error) {
// 4.处理取消请求
if (axios.isCancel(error)) {
requestList.length = 0
store.dispatch('changeGlobalState', {loading: false})
throw new axios.Cancel('cancel request')
} else {
// 5.处理网络请求失败
window.ELEMENT.Message.error('网络请求失败', 1000)
}
return Promise.reject(error)
})1. After the response is returned, delete the corresponding request from the request list
2. When the request list is empty, all requests end and the loading animation ends
3. Unified interception and processing of permission authentication errors
4. The processing of cancellation requests needs to be combined with other code instructions
5. Since the project backend does not use RESTful-style interface requests, all requests other than 200 are classified as network request failures
const CancelToken = axios.CancelToken
//cancel token列表
let sources = []
const request = function (url, params, config, method) {
return new Promise((resolve, reject) => {
axios[method](url, params, Object.assign({}, config, {
//1.通过将执行程序函数传递给CancelToken构造函数来创建cancel token
cancelToken: new CancelToken(function executor (c) {
//2.将cancel token存入列表
sources.push(c)
})
})).then(response => {
resolve(response.data)
}, err => {
if (err.Cancel) {
console.log(err)
} else {
reject(err)
}
}).catch(err => {
reject(err)
})
})
}
const post = (url, params, config = {}) => {
return request(url, params, config, 'post')
}
const get = (url, params, config = {}) => {
return request(url, params, config, 'get')
}
//3.导出cancel token列表供全局路由守卫使用
export {sources, post, get}1.axios cancel token API
2. Save the list of requests that need to be canceled and export it to the navigation guard using
3.router.js
...
import { sources } from '../service/request'
...
router.beforeEach((to, from, next) => {
document.title = to.meta.title || to.name
//路由发生变化时取消当前页面网络请求
sources.forEach(item => {
item()
})
sources.length = 0
next()
})// 引入网络请求库 https://github.com/axios/axios
import axios from 'axios'
import store from '../store'
import router from '../router'
// axios.defaults.timeout = 10000
const requestList = []
axios.defaults.headers.post['Content-Type'] = 'application/json;charset=UTF-8'
axios.defaults.baseURL = process.env.BASE_URL
// 自定义拦截器
axios.interceptors.request.use((config) => {
requestList.push(config.url)
store.dispatch('changeGlobalState', {loading: true})
const token = store.getters.userInfo.token
if (token) {
config.headers.token = token
}
return config
}, function (error) {
return Promise.reject(error)
})
axios.interceptors.response.use(function (response) {
requestList.splice(requestList.findIndex(item => item === response.config.url), 1)
if (requestList.length === 0) {
store.dispatch('changeGlobalState', {loading: false})
}
if (response.data.code === 900401) {
window.$toast.error('认证失效，请重新登录！', 1000)
router.push('/login')
}
return response
}, function (error) {
requestList.length = 0
store.dispatch('changeGlobalState', {loading: false})
if (axios.isCancel(error)) {
throw new axios.Cancel('cancel request')
} else {
window.$toast.error('网络请求失败！', 1000)
}
return Promise.reject(error)
})
const CancelToken = axios.CancelToken
let sources = []
const request = function (url, params, config, method) {
return new Promise((resolve, reject) => {
axios[method](url, params, Object.assign(config, {
cancelToken: new CancelToken(function executor (c) {
sources.push(c)
})
})).then(response => {
resolve(response.data)
}, err => {
reject(err)
}).catch(err => {
reject(err)
})
})
}
const post = (url, params, config = {}) => {
return request(url, params, config, 'post')
}
const get = (url, params, config = {}) => {
return request(url, params, config, 'get')
}
export {sources, post, get}above.
The above is the detailed content of What is axios? Detailed explanation of axios' secondary encapsulation based on business scenarios (example). For more information, please follow other related articles on the PHP Chinese website!
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
