Api调用:调用一个列表的键和值，然后在另一个API调用中循环获取值

async function fetchList() {
    const response = await fetch('/api/list');
    const data = await response.json();
    return data;
}

async function fetchValue(key) {
    const response = await fetch(`/api/value/${key}`);
    const data = await response.json();
    return data;
}

async function processValues() {
    const list = await fetchList();
    for (const item of list) {
        const value = await fetchValue(item.key);
        console.log(`Key: ${item.key}, Value: ${value}`);
    }
}

processValues();

const express = require('express');
const app = express();

const list = [
    { key: 'a', value: 1 },
    { key: 'b', value: 2 },
    { key: 'c', value: 3 }
];

app.get('/api/list', (req, res) => {
    res.json(list);
});

app.get('/api/value/:key', (req, res) => {
    const key = req.params.key;
    const item = list.find(i => i.key === key);
    if (item) {
        res.json(item.value);
    } else {
        res.status(404).json({ message: 'Key not found' });
    }
});

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});

async function processValuesParallel() {
    const list = await fetchList();
    const promises = list.map(item => fetchValue(item.key));
    const results = await Promise.all(promises);
    results.forEach((value, index) => {
        console.log(`Key: ${list[index].key}, Value: ${value}`);
    });
}

processValuesParallel();