如图所示，下拉页面触发刷新，刷新的过程连带一项任务刷新，但是报错未定义“forEach”，我该怎么修改？

js:
  onPullDownRefresh: function () {


    this.getGoodsList()
  },
  getGoodsList:function(e){
    wx.showLoading({
      title: '刷新数据中...',
    })
    db.collection('Orders').where({
      qqaccount: this.data.fuzhi[0].qqaccount
    }).get({
      success:res=>{
        let fuzhi = res.data
        this.setData({
          fuzhi:fuzhi
        })
        wx.stopPullDownRefresh()
      },
      complete:()=>{
        wx.hideLoading()
      }
    })
    this.transfrom()
},
  //校验经验，根据 当前经验 判断显示当前对应的 等级 及 等级图标
  transfrom(fuzhi){
    fuzhi.forEach(element => {  
        if (element.experience <= 456){
          element.level = '列兵1'
          element.pic = 'url'
        }else if (element.experience <= 8026911){
          element.level = '大校 1'
          element.pic = 'url'
        }else if (element.experience <= 8481771){
          element.level = '大校 2'
          element.pic = 'url'
        }
}