How does the vue project handle requests (a brief analysis of the process)

Vue is a popular JavaScript front-end development framework, and its ecosystem supports a large number of UI components, plug-ins and tools. The combination of Vue components and templates can create a responsive user interface that can receive requests from the backend and return data. This article will introduce the request process in the Vue project.

1. Initiate a request

In Vue projects, Axios is usually used to send HTTP requests. Axios is a Promise-based HTTP client that can be used to make data requests in Vue components.

axios({
method: 'get',
url: '/user',
params: {

id: 123

}
})
.then(function (response) {
console.log(response);
})
.catch(function (error) {
console.log(error);
});

This code demonstrates how to use Axios to send a GET request and pass an id parameter. Axios will return a Promise object and handle the response data if the request is successful through the then method, or handle the error message if the request fails through the catch method.

2. Receive requests

Receive HTTP requests in the Vue project, usually using Node.js and Express to build an API server. The API server can receive HTTP requests and convert the requests into query operations for back-end data.

const express = require('express')
const app = express()

app.get('/user', function (req, res) {
const userId = req.query.id
//Query the database to obtain data
const userData = {

id: userId,
name: 'John',
age: 30

}
res.json(userData)
})

app.listen(3000, function () {
console.log('Server is listening on port 3000');
})

This code shows how to use Express to create a GET Routing, the corresponding routing path is /user, get the id parameter in the request. The API server returns a JSON format data object containing the requested user information.

3. Rendering page

In the Vue component, the returned data needs to be rendered. You can use Vue's template syntax and data binding to complete the data display operation.

<script><br/> export default {<br/> data() {</script>

return {
  userData: {}
}

},
mounted() {

const userId = 123
axios.get('/user', {
  params: { id: userId }
})
.then(response => {
  this.userData = response.data
})
.catch(error => {
  console.log(error);
});

}
}

This code demonstrates how to use Vue's single file component to render user information. In the mounted life cycle function, initiate a GET request to obtain user information. After successfully obtaining the user data, update the component's data object to complete the display of the data.

The above is the request process in the Vue project. Developers can customize data request and return formats as needed to meet the needs of components.

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