mongoDB中有一條記錄{? ? "_id" : "1",? ? "titie" : "機械戰警",? ? "language" : "英語",? ? "country" : "美國",? ? "doctor" : "何塞·帕迪里亞",? ? "year" : "2008",? ? "summary" : "機械戰警簡介",? ? "flash" : "/videos/2014061151.swf",? ? "poster" : "/images/logo.png",? ? "meta" : ""}使用.find({})方法獲取數據，只能獲取到{? ? "titie" : "機械戰警",? ? "language" : "英語",? ? "country" : "美國",? ? "doctor" : "何塞·帕迪里亞",? ? "year" : "2008",? ? "summary" : "機械戰警簡介",? ? "flash" : "/videos/2014061151.swf",? ? "poster" : "/images/logo.png",? ? "meta" : ""}少一個_id，求助大神，這是什么情況？