获取小程序二维码返回的二进制转成base64前端为什么显示不出来 <image :src="qrcodeUrl" mode="aspectFill" style="width: 100%;height: 100%;"></image> js代码 wx.request({         url: IP + 'feed/member/invite/bdwxqrcode',     method: 'GET', header: { "Authorization": `Bearer ${uni.getStorageSync("token")}` || '' }, responseType: 'arraybuffer',     success: function (res) { let base64Img = wx.arrayBufferToBase64(res.data); _this.qrcodeUrl = 'data:image/png;base64,' + base64Img     } })