mongoose怎么取得集合内的的字段值

mongoose.connect('mongodb://localhost:27017/ccs', {useNewUrlParser: true,useUnifiedTopology: true});

var Schema = mongoose.Schema;

const user = new Schema({
email: String})

var mm = mongoose.model('cs', user);

mm.find({name:"张三"},function (err,data){
if (!err) console.log(data)
else console.log(err)
})

请问下怎么把张三取出来？