wx.request({
            url: 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=AppSecret',
            method: 'get',
            header: {
                'content-type': 'application/json' // 默認值
            },
            success:(res)=> {
              console.log(res.data.access_token);
            }
        })

let that = this
              wx.request({
                url: 'https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token='+res.data.access_token,
                method: 'POST',
                header: {
                    'content-type': 'application/json' // 默認值
                },
                data:{
                    'path': "/page/index/index?openid=11", // 攜參數openid
                    "width":100//非必填
                },
                responseType: 'arraybuffer', // arraybuffer是以數組的語法處理二進制數據，稱為二進制數組。
                success: function(res) {
                  let data = wx.arrayBufferToBase64(res.data);
                  console.log('data:image/png;base64,' +data);
                  that.setData({
                    myCode: 'data:image/png;base64,' +data
                  })
                  
                }
            })

<image src="{{myCode}}"></image>