s3 分片上传

var params = {Bucket: 'bucket', Key: 'key', Body: stream};
var options = {partSize: 10 * 1024 * 1024, queueSize: 1};
s3.upload(params, options, function(err, data) {
  console.log(err, data);
});

https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#upload-property

用过 Aliyun OSS 分片，没用过 S3