setting maxitems cannot return the data correctly

The custom service：

var query3 =

{

    "filters": {

        "type": "OR",

        "filters":[

            {

                "type":"EQ",

                "fieldName":"mingchen",

                "value":mingchen

            },

            {

                "type":"EQ",

                "fieldName":"suozaiquyu",

                "value":suozaiquyu

            },

            {

                "type":"EQ",

                "fieldName":"tichuzhe",

                "value":tichuzhe

            }

        ]

    } 

}

var params = {

oldestFirst: undefined /* BOOLEAN */,

maxItems: 3 /* NUMBER */,

endDate: undefined /* DATETIME */,

query: query3 /* QUERY */,

startDate: undefined /* DATETIME */

};

// result: INFOTABLE

var result = Things[thingname].QueryPropertyHistory(params);