cos.restoreObject({
    Bucket: 'examplebucket-1250000000', // Enter your own bucket. This is a required field.
    Region: 'COS_REGION', // The region where the bucket resides, for example, ap-beijing. This is a required field.
    Key: '1.jpg', // The object key stored in the bucket, for example, 1.jpg or a/b/test.txt. This is a required field.
    RestoreRequest: {
        Days: 1,
        CASJobParameters: {
            Tier: 'Expedited'
        }
    },
}, function(err, data) {
    console.log(err || data);
});

function(err, data) { ... }