测试文章 05 - Node.js 性能优化指南

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// 不推荐：串行执行
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const user = await getUser(id);
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const posts = await getPosts(id);
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const comments = await getComments(id);
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// 推荐：并行执行
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const [user, posts, comments] = await Promise.all([
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  getUser(id),
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  getPosts(id),
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  getComments(id)
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]);

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const fs = require('fs');
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const zlib = require('zlib');
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// 使用流处理大文件，避免内存溢出
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fs.createReadStream('large-file.txt')
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  .pipe(zlib.createGzip())
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  .pipe(fs.createWriteStream('large-file.txt.gz'));

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// 可能导致内存泄漏
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const cache = {};
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function processData(data) {
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  cache[data.id] = data;  // 无限制增长
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}
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// 使用 LRU 缓存
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const LRU = require('lru-cache');
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const cache = new LRU({ max: 500 });

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const mysql = require('mysql2/promise');
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const pool = mysql.createPool({
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  host: 'localhost',
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  user: 'root',
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  database: 'test',
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  connectionLimit: 10
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});

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// 使用参数化查询防止 SQL 注入
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const [rows] = await pool.execute(
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  'SELECT * FROM users WHERE id = ?',
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  [userId]
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);

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clinic doctor -- node server.js
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clinic flame -- node server.js