cos.getObject({
    Bucket: 'examplebucket-1250000000', /* Enter your own bucket, required field */
    Region: 'COS_REGION',  /* Required field specifying the region where the bucket is located, e.g., ap-beijing */ 
    Key: '1.jpg',  /* The object key stored in the bucket (e.g., 1.jpg, a/b/test.txt), required field */
}, function (err, data) {
    console.log(err || data.Body);
});

    cos.getObject({
    Bucket: 'examplebucket-1250000000', /* Enter your own bucket, required field */
    Region: 'COS_REGION',  /* Required field specifying the region where the bucket is located, e.g., ap-beijing */ 
    Key: '1.jpg',  /* The object key stored in the bucket (e.g., 1.jpg, a/b/test.txt), required field */
    Range: 'bytes=1-3',        /* Optional */
}, function (err, data) {
    console.log(err || data.Body);
});

    cos.getObject({
    Bucket: 'examplebucket-1250000000', /* Enter your own bucket, required field */
    Region: 'COS_REGION',  /* Required field specifying the region where the bucket is located, e.g., ap-beijing */ 
    Key: '1.jpg',  /* The object key stored in the bucket (e.g., 1.jpg, a/b/test.txt), required field */
    Output: './exampleobject',
}, function (err, data) {
    console.log(err || data);
});

    cos.getObject({
    Bucket: 'examplebucket-1250000000', /* Enter your own bucket, required field */
    Region: 'COS_REGION',  /* Required field specifying the region where the bucket is located, e.g., ap-beijing */ 
    Key: '1.jpg',  /* The object key stored in the bucket (e.g., 1.jpg, a/b/test.txt), required field */
    Output: fs.createWriteStream('./exampleobject'),
}, function (err, data) {
    console.log(err || data);
});

    cos.getObject({
    Bucket: 'examplebucket-1250000000', /* Enter your own bucket, required field */
    Region: 'COS_REGION',  /* Required field specifying the region where the bucket is located, e.g., ap-beijing */ 
    Key: '1.jpg',  /* The object key stored in the bucket (e.g., 1.jpg, a/b/test.txt), required field */
    Headers: {
      'x-cos-traffic-limit': 819200, // The valid range for the limit value is 819,200 - 838,860,800, with the default unit being bit/s, i.e., 800Kb/s - 800Mb/s. If it exceeds this range, a 400 error will be returned.
    },
}, function (err, data) {
    console.log(err || data.Body);
});

function(err, data) { ... }

var config = {
    Bucket: 'examplebucket-1250000000', /* Enter your own bucket, required field */
    Region: 'COS_REGION',  /* Required field specifying the region where the bucket is located, e.g., ap-beijing */ 
}

// Example of how to create a directory recursively. You can implement it by yourself.
function mkdirsSync(dirname) {
  if(fs.existsSync(dirname)) {
      return true;
      } else {
    if(mkdirsSync(path.dirname(dirname))) {
      fs.mkdirSync(dirname);
      return true;
}
}
}

// Download a single object
function downloadItem(Key, downloadPath) {
    cos.getObject({
    Bucket: config.Bucket,
    Region: config.Region,
    Key: Key,
      Output: fs.createWriteStream(downloadPath),
    },
    function(err, data) {
    console.log(err || data);
});
}

// Download multiple objects
function batchDownload(marker = undefined) {
  cos.getBucket({
    Bucket: config.Bucket,
    Region: config.Region,
    Prefix: '1',  // Query all files with a prefix of 1
    Marker: marker,
    MaxKeys: 1000,
    },
  function (listError, listResult) {
    if (listError) return console.log(listError);
    // Download to the 'download' directory in the current directory
    var localPath = 'download';
    listResult.Contents.forEach(function (item) {
      var downloadPath = path.resolve(localPath, item.Key);
      var pathParse = path.parse(item.Key);
      if (pathParse.dir) {
        // If the object to be downloaded is in multiple directories, create the corresponding local directories
        // For example, if the Key is a/b/1.png, create a local directory structure like a/b.
        var mkdir = path.resolve(localPath, pathParse.dir);
        mkdirsSync(mkdir);
        downloadItem(item.Key, downloadPath);
      } else {
        downloadItem(item.Key, downloadPath);
}
});
  })
}
batchDownload();

var Key = 'test.zip';
cos.downloadFile({
    Bucket: 'examplebucket-1250000000',
    Region: 'ap-beijing',
    Key: Key,
    FilePath: './' + Key, // Local save path
    ChunkSize: 1024 * 1024 * 8, // Chunk size
    ParallelLimit: 5, // Concurrent number of chunks
    RetryTimes: 3, // Number of retries for failed chunk uploads
    TaskId: '123', // You can generate your own TaskId for canceling the download
    onProgress: function (progressData) {
        console.log(JSON.stringify(progressData));
    },
}, function (err, data) {
    console.log(err || data);
});

// Cancel the download task.
// cos.emit('inner-kill-task', {TaskId: '123'});

function(err, data) { ... }