function buildUrlWithParams(baseUrl, params) {
    const queryString = Object.keys(params)
        .map(key => `${encodeURIComponent(key)}=${encodeURIComponent(params[key])}`)
        .join('&');
    return `${baseUrl}?${queryString}`;
}

const baseUrl = 'https://example.com/api';
const params = {
    keyword: 'JavaScript',
    page: 2,
    sort: 'asc'
};

const url = buildUrlWithParams(baseUrl, params);
console.log(url); // 输出: https://example.com/api?keyword=JavaScript&page=2&sort=asc

function parseUrlParams(url) {
    const queryString = url.split('?')[1];
    if (!queryString) return {};
    return queryString.split('&').reduce((params, pair) => {
        const [key, value] = pair.split('=');
        params[decodeURIComponent(key)] = decodeURIComponent(value);
        return params;
    }, {});
}

const url = 'https://example.com/api?keyword=JavaScript&page=2&sort=asc';
const params = parseUrlParams(url);
console.log(params); // 输出: { keyword: 'JavaScript', page: '2', sort: 'asc' }