无法重现你的问题

担心触发多次，可以这样弄

wxml

bindscancode="{{scaned?’’:‘toScanCodeSuccess’}}"

js

toScanCodeSuccess: function (e) {

    console.log(e);

    this.setData({

        scaned:!0

    }, function(){

        wx.navigateTo({

            url: ‘index2’,

        })

    })

}