42.如何使用"AND"或"OR"条件循环查询集合中的文档 在find()方法中,如果传入多个键,并用逗号(,)分隔它们,那么 MongoDB 会把它看成是AND条件。 >db.mycol.find({key1:value1,key2:value2}).pretty() 若基于OR条件来查询文档,可以使用关键字**$or**。 >db.mycol.find( {$or: [ {key1: value1}, ...
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