js build query

function buildQueryString(params) {
    return Object.keys(params)
        .map(key => encodeURIComponent(key) + '=' + encodeURIComponent(params[key]))
        .join('&');
}

// 使用示例
const queryParams = {
    name: 'John Doe',
    age: 30,
    city: 'New York'
};

const queryString = buildQueryString(queryParams);
console.log(queryString); // 输出: name=John%20Doe&age=30&city=New%20York

function buildQueryString(params) {
    return Object.entries(params)
        .filter(([key, value]) => value !== undefined && value !== null)
        .map(([key, value]) => encodeURIComponent(key) + '=' + encodeURIComponent(value))
        .join('&');
}