db.collection.find() 方法是从集合中检索文档的 JavaScript 方法。db.collection.find() 方法将游标返回给结果；但是，在 mongo shell 中，如果返回的游标没有使用 var 关键字分配给变量，则游标将自动迭代最多 20 次，以打印与查询匹配的前 20 个文档。如果结果多余 20 个，mongo shell 将提示输入“it”再迭代20次。如下：
> db.phrase.find()
{ "_id" : ObjectId("5e63abda2c09b7744fb01b48"), "value" : "春暖花开" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b49"), "value" : "十字路口" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b4a"), "value" : "千军万马" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b4b"), "value" : "白手起家" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b4c"), "value" : "张灯结彩" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b4d"), "value" : "风和日丽" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b4e"), "value" : "万里长城" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b4f"), "value" : "人来人往" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b50"), "value" : "自由自在" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b51"), "value" : "瓜田李下" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b52"), "value" : "助人为乐" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b53"), "value" : "红男绿女" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b54"), "value" : "春风化雨" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b55"), "value" : "马到成功" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b56"), "value" : "拔苗助长" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b57"), "value" : "安居乐业" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b58"), "value" : "走马观花" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b59"), "value" : "念念不忘" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b5a"), "value" : "落花流水" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b5b"), "value" : "一往无前" }
Type "it" for more
> it
{ "_id" : ObjectId("5e63abda2c09b7744fb01b5c"), "value" : "落地生根" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b5d"), "value" : "天罗地网" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b5e"), "value" : "东山再起" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b5f"), "value" : "一事无成" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b60"), "value" : "山清水秀" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b61"), "value" : "语重心长" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b62"), "value" : "别有洞天" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b63"), "value" : "水深火热" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b64"), "value" : "鸟语花香" }
{ "_id" : ObjectId("5e63abdb2c09b7744fb01b65"), "value" : "自以为是" }
>上面，第一次显示了20个文档，然后输入 “it”再次显示了剩余的文档。
我们可以通过改变 DBQuery.shellBatchSize 属性的值去设置批处理大小。实例：将批处理大小修改为5。
> DBQuery.shellBatchSize=5;
5
> db.phrase.find()
{ "_id" : ObjectId("5e63abda2c09b7744fb01b48"), "value" : "春暖花开" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b49"), "value" : "十字路口" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b4a"), "value" : "千军万马" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b4b"), "value" : "白手起家" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b4c"), "value" : "张灯结彩" }
Type "it" for more
> it
{ "_id" : ObjectId("5e63abda2c09b7744fb01b4d"), "value" : "风和日丽" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b4e"), "value" : "万里长城" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b4f"), "value" : "人来人往" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b50"), "value" : "自由自在" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b51"), "value" : "瓜田李下" }
Type "it" for more
> it
{ "_id" : ObjectId("5e63abda2c09b7744fb01b52"), "value" : "助人为乐" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b53"), "value" : "红男绿女" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b54"), "value" : "春风化雨" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b55"), "value" : "马到成功" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b56"), "value" : "拔苗助长" }
Type "it" for more
> it
{ "_id" : ObjectId("5e63abda2c09b7744fb01b57"), "value" : "安居乐业" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b58"), "value" : "走马观花" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b59"), "value" : "念念不忘" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b5a"), "value" : "落花流水" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b5b"), "value" : "一往无前" }
Type "it" for more
> it
{ "_id" : ObjectId("5e63abda2c09b7744fb01b5c"), "value" : "落地生根" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b5d"), "value" : "天罗地网" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b5e"), "value" : "东山再起" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b5f"), "value" : "一事无成" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b60"), "value" : "山清水秀" }
Type "it" for more
> it
{ "_id" : ObjectId("5e63abda2c09b7744fb01b61"), "value" : "语重心长" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b62"), "value" : "别有洞天" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b63"), "value" : "水深火热" }
{ "_id" : ObjectId("5e63abda2c09b7744fb01b64"), "value" : "鸟语花香" }
{ "_id" : ObjectId("5e63abdb2c09b7744fb01b65"), "value" : "自以为是" }
> it
no cursor
