Detailed explanation of using axios to send asynchronous requests in Vue

Vue is an extremely popular front-end framework, and Axios is currently a popular front-end asynchronous request library. This article will introduce in detail how to use Axios to send asynchronous requests in Vue.

Installation and use of Axios
Axios is a Promise-based HTTP client for sending asynchronous requests. We can install it through npm:

npm install axios

Then we can use it in Vue, first we need to import it in the component:

import axios from 'axios '

Then we can use Axios in Vue. Next we will introduce the specific method of using Axios to send asynchronous requests in Vue.

Commonly used methods of Axios
In Axios, the commonly used request methods are GET, POST, PUT, DELETE, etc. These methods correspond to different types of HTTP requests.

For example, we can use Axios to send a GET request:

axios.get('/api/data').then(response => {
console.log(response)
})

Among them, /api/data represents the API interface that needs to be requested.

Similarly, we can send a POST request:

axios.post('/api/data', {
firstName: 'Fred',
lastName: 'Flintstone'
}).then(response => {
console.log(response)
})

The above are the commonly used GET and POST methods in Axios, in addition to PUT , DELETE and other methods. The usage of these methods is the same as the GET and POST methods.

Axios request interception and response interception
In Axios, we can set up request interceptors and response interceptors to do some customized processing of requests and responses.

For example, we can add a token in the request interceptor:

axios.interceptors.request.use(
config => {

// 在请求发送之前做一些处理
const token = localStorage.getItem('token')
if (token) {
  config.headers.Authorization = `Bearer ${token}`
}
return config

},
error => {

// 对请求错误做些什么
return Promise.reject(error)

}
)

In the above code, we determine whether there is a token before sending the request. If so, add it to the request header. in to realize the user authentication function.

In addition, we can also do some processing on the returned data in the response interceptor, such as unified processing of the data or judgment of certain states.

axios.interceptors.response.use(
response => {

// 对响应数据做一些处理
return response

},
error => {

// 对响应错误做些什么
return Promise.reject(error)

}
)

Global configuration of Axios
We can also set some global configurations in Axios, such as setting the request timeout:

axios.defaults.timeout = 10000

The above code means setting the request timeout to 10 seconds. In addition, you can also set the default headers of the request, set the baseURL of the request, etc.

Summary
Axios is one of the mainstream libraries for sending asynchronous requests in Vue. It provides a simple and easy-to-use way to send various requests through Promise. Using Axios in the Vue project can not only improve the performance and maintainability of web applications, but also allow us to better control the request process of web applications.

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