BUG：

getqrcode: function () {

wx.showLoading({

title: '正在生成',

});

const _self = this;

const appPath = encodeURIComponent("pages/detail/index?joinid=" + this.data.JoinId);

const path = config.baseUrl + "/wxopen/qrcode?wxappid=" + app.globalData.wxappid + "&Path=" + appPath;

wx.downloadFile({

url: path, //仅为示例，并非真实的资源

success: function (qrcode) {

console.log(qrcode);

if (qrcode.statusCode === 200) {

var url = _self.data.activity.Img_face[0].replace("http://", "https://");

wx.downloadFile({

url: url, //仅为示例，并非真实的资源

success: function (joinImg) {

if (joinImg.statusCode === 200) _self.getcanvas(qrcode.tempFilePath, joinImg.tempFilePath);

}

})

}

}

})

}

返回unknown的后缀名文件是无法使用的，求官方给解答或者解决