我是mongoDb的新手，我被字符串字段“增量”的问题困住了;)。我在集合“currentactivities”中有以下文档:document={"name":"AppName","totalActive":"10","totalInactive":"60""data":"Somedatageneratedbyapp:2ndkjasndu2iqeqjsma"}我想附加“数据”字段，每天多次使用新的附加字符串值，例如数据如下:“njsadklfu3j2n1km121”所以更新后文档应该是这样的:document={"name":"AppName","totalActive":"10","