Node.js is Web Scale

点击“打开/下载题目”进去看看情况：

为了方便查看翻译成中文简体来看：

emmm，看不懂什么意思，查看源代码，js表示是一段JavaScript代码，丢给AI分析一下：

// server.js
const express = require("express");
const bodyParser = require("body-parser");
const path = require("path");
const { execSync } = require("child_process");const app = express();
app.use(bodyParser.json());
app.use(express.static(path.join(__dirname, "public")));let cmds = {getsource: "cat server.js",test: "echo 'hello, world!'",
};let store = {};// GET /api/store - Retrieve the current KV store
app.get("/api/store", (req, res) => {res.json(store);
});// POST /set - Set a key-value pair in the store
app.post("/set", (req, res) => {const { key, value } = req.body;const keys = key.split(".");let current = store;for (let i = 0; i < keys.length - 1; i++) {const key = keys[i];if (!current[key]) {current[key] = {};}current = current[key];}// Set the value at the last keycurrent[keys[keys.length - 1]] = value;res.json({ message: "OK" });
});// GET /get - Get a key-value pair in the store
app.get("/get", (req, res) => {const key = req.query.key;const keys = key.split(".");let current = store;for (let i = 0; i < keys.length; i++) {const key = keys[i];if (current[key] === undefined) {res.json({ message: "Not exists." });return;}current = current[key];}res.json({ message: current });
});// GET /execute - Run commands which are constant and obviously safe.
app.get("/execute", (req, res) => {const key = req.query.cmd;const cmd = cmds[key];res.setHeader("content-type", "text/plain");res.send(execSync(cmd).toString());
});app.get("*", (req, res) => {res.sendFile(path.join(__dirname, "public", "index.html"));
});// Start the server
const PORT = 3000;
app.listen(PORT, () => {console.log(`KV Service is running on port ${PORT}`);
});

这段代码实现了一个简单的键值对存储服务（KV Store）和一个命令执行功能：

1. 引入依赖