导入导出 use hndb; db.s.save({name:'李四',age:18,score:80,address:'郑州'}); db.s.save({name:'李三',age:8,score:50,address:'郑州'}); db.s.save({name:'张三',age:38,score:20,address:'天津'}); db.s.save({name:'赵六',age:28,score:70,address:'郑州'}); db.s.save({name:'王五五',ag