<view class="b1" hidden="{{flag}}">
        <view class="b2">
            <image src='{{qrcodeUrl}}'/>
        </view> 

var openid=wx.getStorageSync('openid')
     if(openid){
      wx.request({
        url: app.globalData.host+'/getQrcode',
        data: {
           scene: openid+'&'+that.data.goodsid      
        },
        method:'GET',
        header: {
          'content-type': 'application/json'
        },
        success: function(res) {
           console.log(res.data)
           that.setData({
            qrcodeUrl:res.data,
            flag:false
           })
        }
      })