网页源码js

// 使用原生XMLHttpRequest对象
function makeRequest(method, url, callback) {
    var xhr = new XMLHttpRequest();
    xhr.open(method, url);
    xhr.onload = function() {
        if (xhr.status === 200) {
            callback(null, xhr.responseText);
        } else {
            callback(new Error('Request failed with status ' + xhr.status));
        }
    };
    xhr.onerror = function() {
        callback(new Error('Network error'));
    };
    xhr.send();
}

// 使用Promise封装
function makeRequestPromise(method, url) {
    return new Promise((resolve, reject) => {
        var xhr = new XMLHttpRequest();
        xhr.open(method, url);
        xhr.onload = function() {
            if (xhr.status === 200) {
                resolve(xhr.responseText);
            } else {
                reject(new Error('Request failed with status ' + xhr.status));
            }
        };
        xhr.onerror = function() {
            reject(new Error('Network error'));
        };
        xhr.send();
    });
}

// 使用async/await调用
async function fetchData() {
    try {
        const response = await makeRequestPromise('GET', '/api/data');
        console.log(response);
    } catch (error) {
        console.error(error);
    }
}