nodejs：express + js-mdict 作为后端，vue 3 + vite 作为前端，在线查询英汉词典

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node.js + js-mdict 作为后端，vue 3 + vite 作为前端，编写在线查询英汉词典

后端部分（express + js-mdict ）

1. 项目结构

首先，创建一个项目目录，结构如下：cd \js
mkdir mydict-app

mydict-app/
├── public/
│   ├── index.html
│   ├── styles.css
│   └── script.js
├── server/
│   └── app.js
├── package.json
└── README.md

英汉词典文件（*.mdx , *.mdd)  已经放在 /js/testdict/ 

在 public 中添加一些英汉字典的样式：oalecd8e.css , oalecd8e.js , uk_pron.png, us_pron.png,
copy jquery-3.2.1.min.js pulibc\jquery.js 

2. 安装依赖

在项目根目录下运行以下命令，初始化项目并安装所需的依赖：
cd mydict-app
npm init -y
npm install express  cors
added 69 packages in 6s

npm install js-mdict 
added 3 packages in 2s

3. 编写后端代码

创建 app.js 文件，代码如下：

const express = require('express');
const cors = require('cors');
const Mdict = require('js-mdict');
const path = require('path');const app = express();
app.use(cors());
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
// 提供静态文件
app.use(express.static(path.join(__dirname, '../public')));// 加载MDict词典文件
//const mdict = new Mdict('path/to/your/dictionary.mdx');
const mdx = new Mdict.MDX('/js/testdict/oale8.mdx');
const mdd = new Mdict.MDD('/js/testdict/oale8.mdd');const isWord = (txt) => {// 只允许字母、/、空格、-return /^[a-zA-Z \/\-]+$/.test(txt);
};// 处理查询请求，响应：单词的定义(html)
app.get('/query', (req, res) => {let word = req.query.word;if (!word) {return res.status(400).json({ error: 'No word input'});}if (word) {let data = mdx.lookup(word);console.log("cha: "+ word);if(data.definition){res.send(data.definition);} else {res.status(400).send('this word not found');}} else {res.status(400).send('error: No word input');}
});// 处理查询请求，响应：单词的定义(json)
app.get('/search', async (req, res) => {const word = req.query.word;if (!word) {return res.status(400).json({ error: 'No word input'});}console.log("cha: "+ word);try {let data = await mdx.lookup(word);let result;if (data.definition){ result = data.definition;}else { result ='';}res.json({ result });} catch (error) {console.error('Error searching in MDict:', error);res.status(500).json({ error: 'Internal server error' });}
});// 处理前缀查询请求
app.get('/prefix', (req, res) => {let word = req.query.word;// 检查word是否合法if (word.length <2) {return res.status(400).json({ error: 'input too short'});} else if (word.length>50 || !isWord(word)) {return res.status(400).json({ error: 'Invalid input.'});}if (word) {let alist = mdx.prefix(word);console.log("pre: "+ word);if(alist.length >0){let wordls = [];alist.forEach(function(value){wordls.push(value.keyText);});  res.json({wordls});} else {res.status(500).json({ info: 'this word not found'});}} else {res.status(500).json({ error: 'No word input'});}
});// 处理模糊查询请求
app.get('/fuzzy', (req, res) => {let word = req.query.word;// 检查word是否合法if (word.length>50 || !isWord(word)) {return res.status(400).json({ error: 'Invalid input.'});}if (word) {let alist = mdx.fuzzy_search(word,3,1);console.log("fuzzy: "+ word);if(alist.length >0){let wordls = [];alist.forEach(function(value){wordls.push(value.keyText);});  res.json({wordls});} else {res.status(500).json({ info: 'this word not found'});}} else {res.status(500).json({ error: 'No word input'});}
});var MIME = {'css': 'text/css','bmp': 'image','img': 'image','gif': 'image','jpg': 'image/jpeg','png': 'image/png','spx': 'audio/x-speex','wav': 'audio/wav','mp3': 'audio/mp3','js' : 'text/javascript'
};
// 指定目录
const dir1 = "/";// 实现文件下载，*/是路径
app.get('/data/*/:fileName', (req, res, next) => {let path1 = req.params[0]; // 捕获 * 匹配的部分let fileName = req.params.fileName; // 捕获文件名// 检查路径中是否包含非法字符（如 ..）if (path1.includes('..') || fileName.includes('..')) {return res.status(400).send('Invalid path: Path traversal is not allowed.');}let extname = path.extname(fileName);let ext = extname.substring(1).toLowerCase();if (['mp3','spx','wav'].includes(ext)){let filePath = path.join(dir1,path1, fileName);//console.log(filePath);let data = mdd.locate(filePath);if (data){console.log('key: '+ data.keyText);//console.log(Buffer.isBuffer(data.definition));if (data.definition){let binaryData = Buffer.from(data.definition, 'base64');//res.setHeader('Content-Type', 'application/octet-stream');res.set({'Content-Type': MIME[ext] || 'audio','Content-Disposition': 'attachment;','Content-Length': Buffer.byteLength(binaryData)});//console.log(MIME[ext]);res.end(binaryData);} else {res.status(400).send('error: data.definition is null');}} else {res.status(400).send('error: data is null');}} else {res.status(400).send('filename.ext is not .mp3');}
});// 实现文件下载，*/是路径
app.get('/*/:fileName', (req, res, next) => {let path1 = req.params[0]; // 捕获 * 匹配的部分let fileName = req.params.fileName; // 捕获文件名// 检查路径中是否包含非法字符（如 ..）if (fileName.includes('..')) {return res.status(400).send('Invalid path: Path traversal is not allowed.');}//console.log(fileName);let extname = path.extname(fileName);let ext = extname.substring(1).toLowerCase();if (['bmp','gif','jpg','png'].includes(ext)){let filePath = path.join(dir1,path1, fileName);//console.log(filePath);let data = mdd.locate(filePath);if (data){console.log('key: '+ data.keyText);//console.log(Buffer.isBuffer(data.definition));if (data.definition){let binaryData = Buffer.from(data.definition, 'base64');//res.setHeader('Content-Type', 'application/octet-stream');res.set({'Content-Type': MIME[ext] || 'image','Content-Disposition': 'attachment;','Content-Length': Buffer.byteLength(binaryData)});//console.log(MIME[ext]);res.end(binaryData);} else {res.status(400).send('error: data.definition is null');}} else {res.status(400).send('error: data is null');}} else {console.log(fileName);res.status(400).send('filename.ext is not image');}
});const port = process.env.PORT || 8006;
app.listen(port, () => {console.log(`Server is running on port:${port}`);
});

4. 运行后端服务

cd mydict-app
node server/app.js
Server is running on port:8006

---

前端部分（Vue 3 + Vite）

1. 创建前端项目

node -v
v18.20.6
npm -v
10.8.2

cd \js
cnpm create vite@latest mydict-web --template vue
 选 Vue 
 选 JavaScript

项目结构‌：Vite 会自动创建一个基本的项目结构，包括 src目录下的组件、路由和状态管理等文件。主要文件和目录如下：

• App.vue：根组件
• main.js：应用程序入口
• router：Vue Router配置
• store：状态管理

在 public 中添加一些英汉字典的样式：oalecd8e.css , oalecd8e.js , uk_pron.png, us_pron.png,
copy jquery-3.2.1.min.js pulibc\jquery.js 

2. 安装依赖

cd mydict-web
cnpm install axios

cnpm install vue-router -S

 package.json 如下

{"name": "mydict-web","private": true,"version": "0.1.0","type": "module","scripts": {"dev": "vite","build": "vite build","preview": "vite preview"},"dependencies": {"axios": "^1.7.9","vue": "^3.5.13","vue-router": "^4.5.0"},"devDependencies": {"@vitejs/plugin-vue": "^5.2.1","vite": "^6.1.0"}
}

3. 编写前端代码

修改 src/App.vue 文件：

<template><div id="app"><input v-model="sWord" placeholder="请输入英文单词" @keyup.enter="search">&nbsp; <button @click="search">查询</button>&nbsp; <button @click="prefix">前缀查询</button>&nbsp; <button @click="fuzzy">模糊查询</button><div v-if="result"><h3>查询结果</h3><div id="result" name="result" v-html="result"></div></div><div v-if="error">{{ error }}</div></div>
</template><script setup>
import { ref } from 'vue';
import axios from 'axios';const sWord = ref('');
const result = ref('');
const error = ref('');// 查询
const search = async () => {try {const response = await axios.get('http://localhost:8006/search', {params: {word: sWord.value}});result.value = response.data.result;error.value = '';} catch (err) {result.value = '';error.value = err.response?.data?.error || '请求出错，请稍后重试';}
};// 前缀查询
const prefix = async () => {try {const response = await axios.get('http://localhost:8006/prefix', {params: {word: sWord.value}});let items = [];let wordls = response.data.wordls;wordls.forEach((item, i) => {if (i<=20){items[i] = `<a href="http://localhost:8006/query?word=${item}" target="result">${item}</a>`;}});if (items.length >0){ result.value = items.join(', ');}else {result.value = '';}error.value = '';} catch (err) {result.value = '';error.value = err.response?.data?.error || '请求出错，请稍后重试';}
};// 模糊查询
const fuzzy = async () => {try {const response = await axios.get('http://localhost:8006/fuzzy', {params: {word: sWord.value}});let items = [];let wordls = response.data.wordls;wordls.forEach((item, i) => {if (i<=20){items[i] = `<a href="http://localhost:8006/query?word=${item}" target="result">${item}</a>`;}});if (items.length >0){ result.value = items.join(', ');}else {result.value = '';}error.value = '';} catch (err) {result.value = '';error.value = err.response?.data?.error || '请求出错，请稍后重试';}
};</script><style scoped>
#app {font-family: Avenir, Helvetica, Arial, sans-serif;-webkit-font-smoothing: antialiased;-moz-osx-font-smoothing: grayscale;text-align: left;color: #2c3e50;margin-top: 10px;
}
</style>

4. 运行前端项目

cd mydict-web
npm run dev

> mydict-web@0.1.0 dev
> viteVITE v6.1.1  ready in 1083 ms➜  Local:   http://localhost:5173/➜  Network: use --host to expose➜  press h + enter to show help
hShortcutspress r + enter to restart the serverpress u + enter to show server urlpress o + enter to open in browserpress c + enter to clear consolepress q + enter to quit
o

注意事项

• 跨域问题：在开发环境中使用 cors 中间件解决跨域问题，在生产环境中可以通过配置反向代理等方式处理。
• MDX 文件路径：确保 app.js 中的 mdict Path 指向正确的 .mdx 词典文件。
• 安全性：在生产环境中，需要考虑对后端接口进行安全防护，如限制请求频率、验证请求来源等。

通过以上步骤，你就可以实现一个简单的在线英汉词典查询系统。