mongoose中的流查询stream query

mongoose中的流查询stream query,功能类似于php中的mysql_fetch_array,每次从集合中获取一条记录(文档)

var cursor = Person.find({ occupation: /host/ }).cursor();
cursor.on('data', function(doc) {
  // Called once for every document
});
cursor.on('close', function() {
  // Called when done
});