What is the difference between axios and ajax

The difference between axios and ajax: 1. axios is a Promise-based HTTP library, while ajax is an encapsulation of native XHR; 2. ajax technology realizes the refresh of local data, while axios realizes the ajax Encapsulation.

The operating environment of this article: Windows 7 system, ECMAScript version 6, Dell G3 computer.

What is the difference between axios and ajax?

The difference, advantages and disadvantages between axios and ajax:

ajax：

1. What is ajax

##　Ajax is an encapsulation of native XHR. In order to achieve We crossed over and added support for JSONP.

　Asynchronous javascript and xml, ajax is not a new technology, but a combination of multiple technologies. It is used to quickly create dynamic pages and can update data without refreshing to improve user experience. experience.

2. The principle of ajax?

The client requests the ajax engine, and then the ajax engine requests the server. The server makes a series of responses and returns to the ajax engine. The ajax engine decides where to write the result to the client. Achieve data update without page refresh.

3. Core object?

XMLHttpReques

4. What are the advantages and disadvantages of ajax?

Advantages

1. Update data without refreshing

2. Asynchronous communication with the server

3. Front-end and back-end load balancing

4. Widely supported based on standards

5. Separation of interface and application

Disadvantages:

1. Ajax cannot use the Back and history functions, that is, for browsing damage to the organ mechanism.

2. Security issues Ajax exposes the details of interaction with the server

3. The support for the search engine is relatively weak

4. The exception handling mechanism that destroys the program

　5. Violate the original intention of URL and resource positioning

　6. Ajax does not support mobile devices well

　7. Too much client code causes development costs

5. Ajax applicable scenarios　. Form-driven interaction
　.Deep-level tree navigation
　.Fast User-to-user communication and response
　. Insignificant scenarios such as voting, yes/no, etc.
　. Scenarios of filtering data and manipulating related data
　 . Ordinary text input prompts and auto-complete scenarios

6. Ajax is not suitable for scenarios　.Some simple forms
　.Search
.Basic navigation
　.Replace large amounts of text
　.Manipulation of presentation

7, code

$.ajax({
  type: 'POST',
  url: url,
  data: data,
  dataType: dataType,
  success: function () {},
  error: function () {}
});

8. Five steps of ajax request

1. Create XMLHttpRequest asynchronous object

2. Set callback function

3. Use The open method establishes a connection with the server

4. Send data to the server

5. Process different response statuses in the callback function

axios ：

1. What is axios

Axios is a platform based on

Promise HTTP library can be used in browsers and node.js.

2. What features does axios have?

　1. Create XMLHttpRequests in the browser

##　2. Create http requests in node.js

3. Support Promise API

4. Support interception of requests and responses

5. Convert request and response data

6. Cancel requests

7. Automatically convert to JSON data format

8. Client supports defense against XSRF

3. There are two ways to execute get request

// 第一种方式  将参数直接写在url中axios.get('/getMainInfo?id=123')
.then((res) => {
  console.log(res)
})
.catch((err) => {
  console.log(err)
})// 第二种方式  将参数直接写在params中axios.get('/getMainInfo', {  params: {
    id: 123
  }
})
.then((res) => {
  console.log(res)
})
.catch((err) => {
  console.log(err)
})

4. When executing a post request, pay attention to the input parameters of the post request. They do not need to be written in the params field. This should be distinguished from the second method of the get request.

axios.post('/getMainInfo', {
  id: 123})
.then((res) => {
  console.log(res)
})
.catch((err) => {
  console.log(err)
})

The difference between axios and ajax: axios is an encapsulation of ajax technology through Promise, just like jquery The encapsulation of ajax is the same. Simply put, ajax technology realizes the refreshing of local data, and axios realizes the encapsulation of ajax. Some axios have ajax, but some axios may not have ajax. In summary, axios is ajax. Ajax is more than axios.

Note: Traditional Ajax refers to XMLHttpRequest (XHR),

Axios and jQuer ajax are both encapsulation of Ajax

Recommended learning: "ajax video tutorial"

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