并发执行任务的JS代码

async function uploadFile(file) {
    const formData = new FormData();
    formData.append('video', file);

    try {
        const response = await fetch('YOUR_UPLOAD_URL', {
            method: 'POST',
            body: formData,
        });

        if (!response.ok) {
            throw new Error(`Upload failed: ${response.statusText}`);
        }

        const result = await response.json();
        console.log('Upload successful:', result);
    } catch (error) {
        console.error('Error uploading file:', error);
    }
}

async function uploadFiles(files, concurrencyLimit) {
    const uploadQueue = [];
    const results = [];

    for (const file of files) {
        const uploadPromise = uploadFile(file).then(result => {
            results.push(result);
        });

        uploadQueue.push(uploadPromise);

        // 控制并发数
        if (uploadQueue.length >= concurrencyLimit) {
            await Promise.race(uploadQueue); // 等待最先完成的上传
            uploadQueue.splice(uploadQueue.findIndex(p => p === uploadPromise), 1); // 移除已完成的上传
        }
    }

    // 等待所有剩余的上传完成
    await Promise.all(uploadQueue);
    return results;
}

// 使用示例
const fileInput = document.getElementById('fileInput');
const uploadButton = document.getElementById('uploadButton');

uploadButton.addEventListener('click', () => {
    const files = Array.from(fileInput.files);
    const concurrencyLimit = 3; // 设置并发数

    uploadFiles(files, concurrencyLimit)
        .then(results => {
            console.log('All uploads completed:', results);
        })
        .catch(error => {
            console.error('Error during uploads:', error);
        });
});

 如并发上传就是一个并发任务的例子，具体参考：
https://juejin.cn/post/6968714492137979940