使用node做一个简单对话机器人
引入依赖
const nodejieba = require("nodejieba");
const fs = require('fs');
const readline = require('readline');
const express = require('express');
const app = express();
存储问答
创建一个txt文件用来存储预定的问答。
如下图：
部分截取：
你好 你好，有什么可以帮您的吗？
再见 再见，很高兴为您服务！
12312 12312312
12313 12312312
设置目录可访问
const qaPairs = {}
const filePath = 'qa_pairs.txt';
// 设置目录文件可访问
app.use(express.static('./'));
设置接口
分别用于查询和学习
app.get('/QR', (req, res) => {
// 获取传来的值
const question = req.query.question;
const response = chatbotResponse(question);
// 跨域
res.header('Access-Control-Allow-Origin', '*');
res.send(response);
});
app.get('/QRStudy', (req, res) => {
// 获取传来的值
const question = req.query.question;
const answer = req.query.answer;
saveQAPairToFile(question, answer, filePath);
// 跨域
res.header('Access-Control-Allow-Origin', '*');
res.send('success');
});
把问答存入文件
// 把问答对写入文件
function saveQAPairToFile(question, answer, filePath) {
const qaPairStr = `${question}\t${answer}\n`;
fs.appendFile(filePath, qaPairStr, (err) => {
if (err) throw err;
// 写入完成后读取文件并保存到qaPairs
loadQAPairsFromFile(filePath);
});
}
从文件中读取问答
function loadQAPairsFromFile(file) {
const rl = readline.createInterface({
input: fs.createReadStream(file),
crlfDelay: Infinity
});
rl.on('line', (line) => {
const [question, answer] = line.split('\t');
qaPairs[question] = answer;
});
}
通过字典表和分词器，匹配最佳答案
function findClosestQuestion(userInput) {
let closestQuestion = null;
let maxSimilarity = -1;
const userInputSet = new Set(nodejieba.cut(userInput));
for (const question of Object.keys(qaPairs)) {
const questionSet = new Set(nodejieba.cut(question));
const intersection = new Set([...userInputSet].filter(x => questionSet.has(x)));
const similarity = intersection.size / userInputSet.size;
if (similarity > maxSimilarity) {
maxSimilarity = similarity;
closestQuestion = question;
}
}
return closestQuestion;
}
function chatbotResponse(userInput) {
const closestQuestion = findClosestQuestion(userInput);
if (qaPairs[closestQuestion]) {
switch (qaPairs[closestQuestion]) {
case 'mathematical******calculation':
try {
let expression = userInput.match(/[+\-*/0-9]+/g).join('');
let result = eval(expression);
return String(result);
} catch (e) {
return "对不起，我无法理解您的问题。你可以尝试教导我如何回答这个问题。";
}
default:
return qaPairs[closestQuestion];
}
} else {
return "对不起，我无法理解您的问题。你可以尝试教导我如何回答这个问题。";
}
}
读取问答内容并启动服务
// 读取问答对
loadQAPairsFromFile(filePath);
app.listen(9999, () => {
console.log('Server started on port 9999');
});
前端部分
index.html
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no, minimal-ui">
<script src="./vue.global.js"></script>
</head>
<style>
body {
font-family: Arial, sans-serif;
margin: 0;
padding: 0;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: #f2f2f2;
}
.chat-container {
width: 100%;
max-width: 400px;
background-color: white;
border-radius: 10px;
overflow: hidden;
display: flex;
flex-direction: column;
box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
}
.chat-header,
.chat-footer {
padding: 20px;
background-color: #fafafa;
border-bottom: 1px solid #f2f2f2;
}
.chat-header {
border-bottom: 1px solid #f2f2f2;
}
.chat-content {
padding: 20px;
flex-grow: 1;
overflow-y: auto;
max-height: 50vh;
scroll-behavior: smooth;
}
.message {
margin-bottom: 20px;
}
.my-message {
align-self: flex-end;
background-color: #0084ff;
color: white;
padding: 10px;
border-radius: 10px;
}
.their-message {
align-self: flex-start;
background-color: #f2f2f2;
padding: 10px;
border-radius: 10px;
}
.input-message {
flex-grow: 1;
border: none;
padding: 10px;
border-radius: 10px;
margin-right: 10px;
}
.send-button {
padding: 10px;
background-color: #0084ff;
color: white;
border: none;
border-radius: 10px;
cursor: pointer;
}
.modal {
display: none;
position: fixed;
z-index: 1;
left: 0;
top: 0;
width: 100%;
height: 100%;
overflow: auto;
background-color: rgb(0, 0, 0);
background-color: rgba(0, 0, 0, 0.4);
}
.modal-content {
background-color: #fefefe;
margin: 15% auto;
padding: 20px;
border: 1px solid #888;
width: 80%;
}
#feedbackButton {
background-color: #0084ff;
color: white;
border-radius: 5px;
border: none;
align-self: flex-end;
padding: 5px;
margin-top: 20px;
}
.loading-dots {
display: flex;
justify-content: center;
padding: 10px 0;
}
.dot {
display: inline-block;
width: 10px;
height: 10px;
border-radius: 50%;
margin: 0 5px;
background-color: white;
animation: pulse 1s ease-in-out infinite;
}
.dot:nth-child(2) {
animation-delay: 0.2s;
}
.dot:nth-child(3) {
animation-delay: 0.4s;
}
@keyframes pulse {
0% {
transform: scale(1);
}
50% {
transform: scale(1.5);
}
100% {
transform: scale(1);
}
}
</style>
<body>
<div id="app">
<div class="chat-container">
<div class="chat-header">聊天</div>
<div class="chat-content">
<div v-for="(item,index) in questionAndAnswer">
<div v-if="item.question" class="message">
<div class="my-message">
{{item.question}}
</div>
</div>
<div v-if="machineLoading&&index==questionAndAnswer.length-1" class="message">
<div class="their-message">
<div class="loading-dots">
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
</div>
</div>
</div>
<div v-if="item.answer" class="message">
<div class="their-message">
{{item.answer}}
</div>
</div>
</div>
</div>
<div class="chat-footer">
<input type="text" v-model="question" class="input-message" placeholder="输入消息...">
<button @click="sendMsg" class="send-button">{{sendMsgLock?'....':'发送'}}</button>
</div>
</div>
<button id="feedbackButton">教导机器学习新知识</button>
<div id="feedbackModal" class="modal">
<div class="modal-content">
<span id="closeButton">×</span>
<p>碰到以下问题</p>
<input placeholder="请输入问题" v-model="updateQuestionAndAnswer.question">
<p>你希望我怎么回答：</p>
<textarea id="feedbackText" v-model="updateQuestionAndAnswer.answer" placeholder="你希望我怎么回答？" rows="4"
cols="40"></textarea>
<div>
<button @click="submitBtn" id="submitButton">提交</button>
</div>
</div>
</div>
</div>
</body>
<script>
const { createApp } = Vue
createApp({
data() {
return {
message: 'Hello Vue!',
questionAndAnswer: [{
question: '',
answer: '你好，你可以问我任何问题，我会尽力回答你的问题。'
}, {
question: '',
answer: '如果你愿意教我怎么回答，可以点击下面的按钮。你的教导会让我变得更聪明。'
}],
question: '',
updateQuestionAndAnswer: {
question: '',
answer: ''
},
machineLoading: false,
sendMsgLock: false
}
},
methods: {
// 是否可以发送消息
canSendMsg() {
return this.sendMsgLock
},
sendMsg() {
if (this.canSendMsg()) {
return
}
if (!this.question) {
alert('请输入内容')
return
}
this.draw(this.question, '')
this.requestMeth(`http://106.54.39.111:9999/QR?question=${this.question}`, (res) => {
this.draw('', res)
})
},
// 显示隐藏machineLoading
showMachineLoading(bool) {
this.machineLoading = bool
},
// 渲染消息
draw(question = '', answer = '') {
this.sendMsgLock = true
this.drawText({
question,
answer
}, () => {
this.sendMsgLock = false
},question?true:false)
},
// 逐条输出内容
drawText(obj, callback, bool) {
let text = obj.answer;
if (bool) {
this.questionAndAnswer.push({
question: obj.question,
answer: obj.answer
})
this.scrollToBottom();
return;
}
let that = this;
that.questionAndAnswer.push({
question: '',
answer: ''
})
let i = 0;
let timer = setInterval(() => {
if (i < text.length) {
that.questionAndAnswer[that.questionAndAnswer.length - 1].answer += text[i];
i++;
} else {
clearInterval(timer);
callback();
}
this.scrollToBottom();
}, 100)
},
// 发起请求
requestMeth(url, callback) {
let that = this;
this.showMachineLoading(true);
this.question = '';
let xhr = new XMLHttpRequest();
xhr.open('get', url, true);
xhr.send();
xhr.onreadystatechange = function () {
if (xhr.readyState == 4 && xhr.status == 200) {
that.showMachineLoading(false)
callback(xhr.responseText)
}
}
},
// overflow auto 移动到底部
scrollToBottom() {
this.$nextTick(() => {
let chatContent = document.querySelector('.chat-content')
chatContent.scrollTop = chatContent.scrollHeight
})
},
// 提交
submitBtn() {
// 判断输入框是否为空
if (!this.updateQuestionAndAnswer.question) {
alert('我一直认为学习很枯燥，但我听说你可以让学习变得很有趣。你能告诉我你的秘诀吗？')
return
}
if (!this.updateQuestionAndAnswer.answer) {
alert('我一直认为学习很枯燥，但我听说你可以让学习变得很有趣。你能告诉我你的秘诀吗？')
return
}
let that = this;
this.requestMeth(`http://106.54.39.111:9999/QRStudy?question=${this.updateQuestionAndAnswer.question}&answer=${this.updateQuestionAndAnswer.answer}`, function (res) {
that.draw('', '感谢你教我怎么回答，我现在可以回答更多问题了');
});
modal.style.display = "none";
}
}
}).mount('#app')
var modal = document.getElementById("feedbackModal");
var btn = document.getElementById("feedbackButton");
var span = document.getElementById("closeButton");
btn.onclick = function () {
modal.style.display = "block";
}
span.onclick = function () {
modal.style.display = "none";
}
window.onclick = function (event) {
if (event.target == modal) {
modal.style.display = "none";
}
}
</script>
</html>
这个问答机器人足够的简单，想实现复杂的功能需要应用到人工智能模型。
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