代码：

var fs = require('fs');
var rs = fs.createReadStream('./unicycle.jpg');
var data = '';
rs.on('data', function(trunk) {
	data += trunk;
});
rs.on('end', function() {
	oss.putObject({
		Bucket: '某个之',
		Key: 'unicycle.jpg',
		Body: data
	}, function(err, data) {

		if (err) {
			console.log('error:', err);
			return;
		}

		console.log('success:', data);

	});
});