How to encapsulate uniapp's request

With the development and popularity of mobile applications, front-end technologies and frameworks are also constantly iterated and updated. Among them, uniapp, as a cross-platform framework, is loved and praised by the majority of front-end developers. In actual development, encapsulating uniapp's request request is an essential part. Next, let’s take a look at how to encapsulate uniapp’s request.

1. Introduction to uniapp's request
The request in uniapp is encapsulated based on the native XMLHttpRequest. It can initiate HTTP requests and process them after receiving the server response. In actual development, we need to encapsulate uniapp's request to facilitate calling and processing the request results.

2. Encapsulating the request of uniapp

1. Encapsulating the request
   When encapsulating the request, we can use the Promise object to encapsulate the asynchronous operation. First, we need to introduce the request module of uniapp and define a method to encapsulate the request.

import {request} from 'uni-app'

const http = (config) => {
    return new Promise((resolve, reject) => {
        const options = {
            url: config.url,
            method: config.method || 'GET',
            data: config.data || {},
            header: config.header || {},
            success: res => {
                if (res.statusCode === 200) {
                    resolve(res.data)
                } else {
                    reject(res)
                }
            },
            fail: err => {
                reject(err)
            }
        }
        uni.request(options)
    })
}

export default http

In the above code, we use the ES6 arrow function to define a method named http to encapsulate the Uniapp request request. It should be noted that here we encapsulate the request request into a Promise object so that it can be processed asynchronously after the request result is returned.

2. Uniform processing of error information
   In actual development, in order to improve the maintainability and readability of the code, we usually need to perform unified error handling on the request results. The following is a sample code for unified error handling of request results.

import {request} from 'uni-app'
import {Toast} from 'vant'

const http = (config) => {
    return new Promise((resolve, reject) => {
        const options = {
            url: config.url,
            method: config.method || 'GET',
            data: config.data || {},
            header: config.header || {},
            success: res => {
                if (res.statusCode === 200) {
                    resolve(res.data)
                } else {
                    let err = new Error()
                    err.statusCode = res.statusCode
                    reject(err)
                }
            },
            fail: err => {
                let error = new Error()
                error.statusCode = 500
                reject(error)
            }
        }
        uni.request(options)
    })
}

export default function(config) {
    return http(config).catch(err => {
        if (err.statusCode === 404) {
            Toast.fail('请求资源不存在')
        } else if (err.statusCode === 500) {
            Toast.fail('服务器内部错误')
        }
    })
}

In the above code, we have targeted the error information so that when requesting data fails, the user can be intuitively prompted with error information and improve the user's interactive experience.

3. Conclusion
This article aims to introduce how to encapsulate uniapp's request request so that request results and error messages can be better processed in actual development. When encapsulating request requests, we need to pay attention to improving the maintainability and readability of the code as much as possible, so as to quickly locate and solve problems during future maintenance and improvements.

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