inc 使用报错？请问到底是什么原因 - WXOPEN Club

guest:function(e){

var num

const db = wx.cloud.database()

db.collection('guest').doc(

'xxxxxxxxxxxxx').update({

data: {

num:_inc(1)

},

success: function (res) {

console.log(res.data)

}

})

},

VM267:1 thirdScriptError

_inc is not defined; [Component] Event Handler Error @ pages/index2/index2#bound guest

ReferenceError: _inc is not defined

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