wx.chooseMedia发布后的代码，点击图片，可以弹出选择图片，但是选择图片后点击完成，并没有覆盖image的src属性，代码如下upload_qrcode(event) {
        let that = this
        wx.chooseMedia({
            count: 1, 
            sizeType: ["original", "compressed"], 
            sourceType: ["album", "camera"], 
            success: function (res) {
                var url = res.tempFiles[0].tempFilePath
                if (url == "" || url == null) {
                    url = res.tempFilePaths[0]//没什么用处
                }
                wx.uploadFile({
                    url: appObj.url + "uploadfile",
                    filePath: url,
                    name: 'file',
                    success(res) {
                        var ls_obj = JSON.parse(res.data)
                        url = ls_obj.url
                        console.log("返回结果",url);
                        that.setData({
                            imgSrc: url
                        })
                    }
                })



            },
            fail: function (res) {
                //选取失败后执行的操作
            }
        })


    },