How to automatically reply in nodejs

With the popularity of social media, people increasingly need to be online in real time and respond to customers quickly to maintain good communication and relationships. This also brings huge pressure and challenges to companies or individuals. In order to deal with this problem, you can use node.js to build an automatic reply program to improve work efficiency and customer satisfaction.

1. Introduction to node.js

Node.js is a JavaScript runtime based on the Chrome V8 engine, which allows JavaScript to run on the server to achieve efficient network application development. It can easily handle I/O-intensive operations such as network requests, file reading, and database access.

Node.js is a non-blocking asynchronous I/O platform that can use JavaScript to build efficient and highly scalable network applications. It is event-driven, which means that when an event occurs, Node.js triggers a callback function (callback) without blocking subsequent code execution.

2. Use node.js to implement automatic reply

1. Install relevant modules

The following three are required to build WeChat automatic reply using Node.js Module:

(1) Weixin (github address: https://github.com/node-webot/weixin): A Node.js framework for processing WeChat messages.

(2) wechat (github address: https://github.com/node-webot/wechat): A Node.js library used to process WeChat public account messages.

(3) express (github address: https://github.com/expressjs/express): A web application framework based on Node.js for creating scalable web and mobile applications.

You can use the npm command line tool to install the above modules:

npm install weixin wechat express

2. Create a public account and configure developer mode

Register on the WeChat public platform and create your own public account, then enable and configure the developer mode. I won’t go into details here.

3. Write code

Next, we can write node.js code to implement the automatic reply function. The following is a specific code example, in which token, appid, appsecret, port and hostname are custom parameters.

const http = require("http");
const url = require("url");
const crypto = require("crypto");
const express = require("express");
const wechat = require("wechat");

const token = "your token here";  // 设置token
const appid = "your appid here";  // 设置appID
const appsecret = "your appsecret here";  // 设置appsecret
const port = 80;  // 设置端口
const hostname = "your hostname here";  // 设置服务器名

// 对token、timestamp和nonce进行字典序排序并进行sha1加密
function sha1(str){
    const hash = crypto.createHash("sha1");
    hash.update(str);
    return hash.digest("hex");
}

// 微信接入验证
function wxVerify(req, res){
    const query = url.parse(req.url, true).query;
    const signature = query.signature;
    const timestamp = query.timestamp;
    const nonce = query.nonce;
    const echostr = query.echostr;
    const str = [token, timestamp, nonce].sort().join("");
    if (signature === sha1(str)){
        res.send(echostr);
    } else {
        res.send("error");
    }
}

// 微信动作处理
const wxFun = function(req, res){
    const info = req.weixin;
    console.log(info);
    res.reply("这是自动回复的内容");  // 发送自动回复内容
}

const app = express();
app.use("/wx", wechat({
    token: token,
    appid: appid,
    appsecret: appsecret,
    encodingAESKey: "", // 推荐使用的配置项
    checkSignature: false,
    // 微信接入验证
    verify: wxVerify,
    // 处理微信消息的回调函数
    message: wxFun
}))
app.listen(port, hostname);
console.log("Server running at http://" + hostname + ":" + port);

4. Test code

After running the code, enter the customized keywords in the WeChat public platform, and you can see that node.js automatically replies with the preset reply content.

3. Summary

node.js can be used to build efficient and highly scalable network applications. As an important customer communication channel, WeChat official account needs to handle user inquiries and feedback quickly and in real time. Using node.js to build an automatic reply program can greatly improve customer service quality and efficiency.

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