Javascript回调没有引用正确的状态值

function fetchData(callback) {
    let data = 'initial data';
    setTimeout(() => {
        data = 'updated data';
        callback(data); // 传递正确的状态值
    }, 1000);
}

fetchData((result) => {
    console.log(result); // 输出 'updated data'
});

function fetchData() {
    return new Promise((resolve) => {
        let data = 'initial data';
        setTimeout(() => {
            data = 'updated data';
            resolve(data); // 使用Promise传递正确的状态值
        }, 1000);
    });
}

async function getData() {
    const result = await fetchData();
    console.log(result); // 输出 'updated data'
}

getData();

function fetchData() {
    return new Promise((resolve) => {
        let localData = 'initial data';
        setTimeout(() => {
            localData = 'updated data';
            resolve(localData); // 使用局部变量传递正确的状态值
        }, 1000);
    });
}

async function getData() {
    const result = await fetchData();
    console.log(result); // 输出 'updated data'
}

getData();