js怎么调用两个ajax

// 第一个AJAX请求
var xhr1 = new XMLHttpRequest();
xhr1.open('GET', 'url1', true);
xhr1.onreadystatechange = function() {
    if (xhr1.readyState === 4 && xhr1.status === 200) {
        console.log('第一个请求的结果:', xhr1.responseText);
        
        // 第二个AJAX请求
        var xhr2 = new XMLHttpRequest();
        xhr2.open('GET', 'url2', true);
        xhr2.onreadystatechange = function() {
            if (xhr2.readyState === 4 && xhr2.status === 200) {
                console.log('第二个请求的结果:', xhr2.responseText);
            }
        };
        xhr2.send();
    }
};
xhr1.send();

function makeAjaxRequest(url) {
    return new Promise(function(resolve, reject) {
        var xhr = new XMLHttpRequest();
        xhr.open('GET', url, true);
        xhr.onreadystatechange = function() {
            if (xhr.readyState === 4) {
                if (xhr.status === 200) {
                    resolve(xhr.responseText);
                } else {
                    reject(new Error('请求失败'));
                }
            }
        };
        xhr.send();
    });
}

Promise.all([makeAjaxRequest('url1'), makeAjaxRequest('url2')])
    .then(function(results) {
        console.log('第一个请求的结果:', results[0]);
        console.log('第二个请求的结果:', results[1]);
    })
    .catch(function(error) {
        console.error('请求失败:', error);
    });

async function makeAjaxRequests() {
    try {
        const response1 = await makeAjaxRequest('url1');
        console.log('第一个请求的结果:', response1);
        
        const response2 = await makeAjaxRequest('url2');
        console.log('第二个请求的结果:', response2);
    } catch (error) {
        console.error('请求失败:', error);
    }
}

makeAjaxRequests();