How does uniapp implement data and business processing without using cloud functions?

Recently, more and more developers have begun to use uniapp, a cross-platform development framework, for application development. When developing using uniapp, some developers will use cloud functions for data interaction and business processing. But in fact, uniapp does not necessarily need to use cloud functions. Developers can implement data and business processing in other ways.

Methods without using cloud functions:

1. Use interfaces for data interaction

In uniapp, you can perform data interaction by calling the interface. The interface can be written on the server side, and the front end can obtain data by calling the interface. At the same time, the data can also be transmitted to the server side through the interface.

If the server language is node.js, you can use the Express framework for interface development.

For example, implement an interface to obtain the user list:

const express = require('express');
const app = express();
const port = 3000;

app.get('/users', function(req, res) {
  // 获取用户列表的逻辑

  res.json(users);
});

app.listen(port, function() {
  console.log(`Server listening on port ${port}`);
});

Then call this interface on the front end:

uni.request({
    url: 'http://localhost:3000/users',
    success: function(res) {
        console.log(res.data);
    }
});

2. Use the official plug-in of uni-app

uniapp also provides official plug-ins, which developers can use directly to implement certain functions. For example, when using Alipay to pay in uniapp, you can directly use the plug-in alipay-sdk officially provided by Alipay.

import alipaySDK from 'alipay-sdk'

alipaySDK.auth(authParams, function(autherror, authdata) {
  if (!autherror) {
    alipaySDK.getAuthorizeUrl(getAuthorizeUrlParams, function(getAuthorizeUrlerror,getAuthorizeUrl) {
      if (!getAuthorizeUrlerror) {
        uni.navigateTo({
          url: '/pages/hello/hello?url=' + getAuthorizeUrl
        })
      }
    });
  }
});

3. Use third-party services

uniapp can implement certain functions through other third-party services, such as data storage and processing through Leancloud.

In Leancloud, operations such as addition, deletion, modification, and query of data can be performed through Leancloud's REST API or SDK.

// 引入 SDK
import AV from 'leancloud-storage';



// 初始化 SDK
AV.init({
    appId: "AppID",
    appKey: "AppKey"
});



// 创建 Todo 类
const Todo = AV.Object.extend('Todo');



// 新增一条 Todo
const todo = new Todo();
todo.set('title', '测试');
todo.save().then(function (todo) {
    console.log('保存成功');
}, function (error) {
    console.error('保存失败', error);
});



// 查询 Todo 列表
const query = new AV.Query('Todo');
query.find().then(function (results) {
    console.log('查询成功', results);
}, function (error) {
    console.error('查询失败', error);
});

Summary:

Through the above three methods, we can implement data interaction and business processing in uniapp without having to use cloud functions. Of course, the emergence of cloud functions can well solve some problems, such as the calculation and processing of large amounts of data. But when the application scale is not very large, we can use the above methods for development, which can also achieve functions and be more lightweight and flexible.

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