先看集合post中文档信息：

>db.post.find();{"_id":ObjectId("54a51cfd7f46906f81b7adcd"),"bar":"baz"}{"_id":0}{"_id":1}{"_id":2}{"_id":5,"test1":0}{"_id":4,"test2":2}{"_id":3,"test3":3}{"_id":6,"test5":5}{"_id":7,"test1":1}{"_id":8,"test1":1}

删除指定的文档：

>db.post.remove({"_id":5});WriteResult({"nRemoved":1})>db.post.find();{"_id":ObjectId("54a51cfd7f46906f81b7adcd"),"bar":"baz"}{"_id":0}{"_id":1}{"_id":2}{"_id":4,"test2":2}{"_id":3,"test3":3}{"_id":6,"test5":5}{"_id":7,"test1":1}{"_id":8,"test1":1}

删除所有｛“test1”：1｝的文档：

>db.post.remove({"test1":1});WriteResult({"nRemoved":2})>db.post.find();{"_id":ObjectId("54a51cfd7f46906f81b7adcd"),"bar":"baz"}{"_id":0}{"_id":1}{"_id":2}{"_id":4,"test2":2}{"_id":3,"test3":3}{"_id":6,"test5":5}>


删除整个post集合：

>db.post.drop()true>showcollectionssystem.indexes>