Let's talk about synchronous and asynchronous request settings in vue

Vue.js is a very popular front-end framework that supports asynchronous requests and also provides synchronous request methods. In development, sometimes we need to make synchronous requests. This article will introduce the synchronous request settings and asynchronous request settings in Vue.

1. What is a synchronous request?
In front-end development, we usually use asynchronous requests (such as Ajax) to interact with back-end data. Asynchronous request means that after sending the request, it does not wait for the request to return, but directly executes the subsequent code and waits for the data to be returned before processing. Synchronous requests, after sending the request, will wait for the request to return before executing subsequent code, and will not continue execution until the request returns.

2. Synchronous request settings in Vue
Vue uses axios for data requests, and the default request method of axios is asynchronous. If you need to make a synchronous request, you need to set it to synchronous mode. The synchronization setting method is as follows:

1. Change the value of axios.defaults.adapter to http (the default http module in node.js)

axios.defaults.adapter = require('axios/lib/adapters/http');

2. Change the request method of axios to post, and set async to false to implement synchronous requests.

axios({method:'post',url:url,data:data,async:false})

It should be noted that using synchronous requests may cause page freezes. It is recommended to use it when necessary.

3. Asynchronous request settings in Vue
In Vue, asynchronous requests are a common method, and are generally sent using axios. The following are common methods of axios:

1.get request

axios.get('/user?id=234')
  .then(function (response) {
    console.log(response);
  })
  .catch(function (error) {
    console.log(error);
  });

2.post request

axios.post('/user', {
    firstName: 'Fred',
    lastName: 'Flintstone'
  })
  .then(function (response) {
    console.log(response);
  })
  .catch(function (error) {
    console.log(error);
  });

3.Public request configuration

axios.defaults.baseURL = 'https://api.example.com';
axios.defaults.headers.common['Authorization'] = AUTH_TOKEN;
axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';

IV. Summary
This article mainly introduces the synchronous request and asynchronous request setting methods in Vue. In actual development, you need to choose different request methods according to your needs, and you also need to pay attention to the impact of request methods on page performance. Special attention should be paid to the fact that synchronous requests will freeze the page and lead to poor user experience, and should be avoided as much as possible.

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