js中url传值

function getQueryParamByName(name) {
    let queryStr = window.location.search.substring(1); // 去除开头的'?'
    let paramsArray = queryStr.split('&');
    for (let i = 0; i < paramsArray.length; i++) {
        let pair = paramsArray[i].split('=');
        if (decodeURIComponent(pair[0]) === name) {
            return decodeURIComponent(pair[1]);
        }
    }
    return null;
}

// 使用示例
let userName = getQueryParamByName('name');

function buildUrlWithParams(baseUrl, params) {
    let queryStr = Object.keys(params)
        .map(key => encodeURIComponent(key) + '=' + encodeURIComponent(params[key]))
        .join('&');
    return baseUrl + (queryStr ? '?' + queryStr : '');
}

// 使用示例
let baseUrl = 'http://example.com/page';
let params = { name: 'John', age: 30 };
let url = buildUrlWithParams(baseUrl, params);
console.log(url); // 输出: http://example.com/page?name=John&age=30