第一关
命令行输入：
mongo
use mydb
db.mydb.insert({_id:1,name:"李小红"})
第二关
命令行输入：
mongo
use Testdb2
db. t_stu.insert([{_id:1,name:"小明",sex: "男",hobbies: ["乒乓球","羽毛球"]},
{_id:2,name:"小红",sex: "女",hobbies: ["画画","唱歌"]}])
第三关：
命令行输入：
mongo
use Testdb3
document=([{_id:1,name:"张小华",sex: "男",phone: "12356986594",hobbies: ["打篮球","踢足球","唱歌"]}]);
db.stu1.insert(document)
db.stu2.insert(document)
db.stu3.insert(document)
db.stu2.update({phone: "12356986594"},{$set:{ phone: "18356971462"}})
db.stu3.save({_id:1,name:"张晓晓",sex: "女",phone: "12365498704",hobbies: ["
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