神奇的mongo：找出某个集合中包含boolean数据的文档

db_name = "test"table_name = "test"db = connect( db_name )fields = ["field1", "field2"]for (field in fields){    field = fields[field]    code ='typeof this.' + field + ' == "boolean"'     cnt = db[ table_name ].count({$where: code })         if (cnt > 0) {        print(field, cnt)        db[ table_name ].find({$where: code}).forEach(function(doc){ printjson(doc) })    }}