Where is the front-end interface of uniapp written?

With the rapid development of mobile Internet and cloud computing technology, web applications and mobile applications have become the mainstream of the modern Internet era. In this process, the importance of front-end technology has become more and more prominent, and front-end interface writing has become an indispensable skill for front-end engineers. This article will explore where to write the uniapp front-end interface.

Uniapp is a development framework based on Vue.js. It is a cross-platform framework that can develop iOS, Android and Web applications at the same time. In uniapp, the writing of the front-end interface is mainly divided into two parts: the back-end interface and the front-end interface.

Backend interface

The backend interface refers to the interface provided by the server to the front-end application. Uniapp front-end developers can access these interfaces through http requests and obtain the data that needs to be displayed.

The code of the back-end interface is usually written by developers on the server side. Developers need to pass data from the server side to the front-end application in the form of text or JSON through data docking and data extraction. In uniapp , the URL of the backend interface is generally an address starting with "/api". The server-side code can be written in any language, such as Java, Python, PHP and other languages; the server-side data can be structured data stored in the database, such as MySQL, Oracle and other relational databases, or text data, XML data , JSON data, etc., developers can choose according to their needs.

In uniapp, developers usually use axios.js, a third-party library, to send Ajax requests to call the backend interface. Axios.js is a Promise-based HTTP client that supports browsers and Node.js. In front-end development, it can be used to exchange data with the back-end more conveniently. The following is a sample code that uses Axios.js to call the back-end interface:

import axios from 'axios';
export default {
  data() {
    return {
      userInfo: {}
    };
  },
  mounted() {
    axios.get('/api/userInfo').then(response => {
      this.userInfo = response.data;
    }).catch(error => {
      console.log(error);
    });
  }
}

Front-end interface

The front-end interface refers to the interface provided by the front-end application to the back-end server, usually through user input , mouse click and other actions triggered. The main function of the front-end interface is to send data to the back-end server to implement various business operations. For example, user login, user registration, password change, etc. all need to use the front-end interface to interact with the back-end.

The writing of the front-end interface is completed by front-end developers. Front-end interfaces are usually written in front-end applications in the form of JavaScript or TypeScript code. These interfaces are responsible for processing user input and displaying program results, interaction, validation, etc.

In uniapp, the writing of the front-end interface mainly relies on the two front-end libraries of Vue.js, Vue-Resource library and Axios.js. Among them, the Vue-Resource library is the HTTP client library officially recommended by Vue.js. It supports Promise and interceptors, and can filter and convert data, allowing developers to process data more flexibly. The following is a sample code that uses the Vue-Resource library to call the front-end interface:

import Vue from 'vue';
import VueResource from 'vue-resource';
Vue.use(VueResource);
export default {
  data() {
    return {
      username: '',
      password: ''
    };
  },
  methods: {
    login() {
      this.$http.post('/api/login', {
        username: this.username,
        password: this.password
      }).then(response => {
        console.log(response.data);
      }).catch(error => {
        console.log(error);
      });
    }
  }
}

As shown in the above code, we sent a request to the server in POST mode through the $http.post method of the Vue-Resource library. , the target of the request is "/api/login", and the requested data contains the login username and password. After receiving the request, the server will verify the user's identity based on these parameters.

Summary

The writing of the uniapp front-end interface includes the writing of the back-end interface and the front-end interface. The back-end interface is mainly responsible for the back-end developers and is usually used to send data to the front-end; while the front-end The interface is written by front-end developers and is used to process user input and display program results, interaction, verification, etc. Whether it is writing back-end interfaces or front-end interfaces, uniapp provides a wealth of third-party libraries, such as axios.js and Vue-Resource, which can help developers complete data interaction operations more conveniently.

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