如何获取get参数？

function getQueryParam(param) {
    const urlParams = new URLSearchParams(window.location.search);
    return urlParams.get(param);
}

// 示例使用
const userId = getQueryParam('userId');
console.log(userId); // 输出: 123

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

app.get('/user', (req, res) => {
    const userId = req.query.userId;
    res.send(`User ID: ${userId}`);
});

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

from flask import Flask, request

app = Flask(__name__)

@app.route('/user')
def user():
    user_id = request.args.get('userId')
    return f'User ID: {user_id}'

if __name__ == '__main__':
    app.run(port=5000)

const encodedParam = encodeURIComponent('user name');
console.log(encodedParam); // 输出: user%20name