语法
db.文档名称.find().pretty()
多个键(key)语法，每个键(key)以逗号隔开
db.col.find({key1:value1, key2:value2}).pretty()
实例
db.col.find({"by":"菜鸟教程", "title":"MongoDB 教程"}).pretty()
{
"_id" : ObjectId("56063f17ade2f21f36b03133"),
"title" : "MongoDB 教程",
"description" : "MongoDB 是一个 Nosql 数据库",
"by" : "菜鸟教程",
"url" : "http://www.runoob.com",
"tags" : [
"mongodb",
"database",
"NoSQL"
],
"likes" : 100}
