wx.downloadFile是报错,视频地址是http://www.iesdouyin.com/aweme/v1/play/?video_id=v0200fg10000col413jc77u6dot73i8g&ratio=1080p&line=0,

放到浏览器可以正常播放,使用这个组件时开发工具却下载了一个json文件,手机调试是直接报错的,报的就是downloadFile:fail file data is empty?

downloadVideo: function() {

    let that = this;

    let url_video = that.data.url_video;

    console.log(url_video)

    if (!url_video.includes("https")){

      url_video = url_video.replace("http","https")

    }

    let httpHost = app.globalData.httpHost;

    console.log("执行了")

    let task = wx.downloadFile({

      url: url_video, 

      success(res) {

        // 只要服务器有响应数据，就会把响应内容写入文件并进入 success 回调，业务需要自行判断是否下载到了想要的内容

        if (res.statusCode === 200) {

          wx.saveVideoToPhotosAlbum({

            filePath: res.tempFilePath,

            success(res) {

              console.log(res.errMsg)

              wx.showToast({

                title: '保存成功',

              }) 

            },

            fail(res){

              wx.showModal({

                title: '提示',

                content: '视频未保存成功',

                showCancel: true,

                confirmText: '确定',

              })

            }

          })

        }

      },

      fail(res){

        console.log("错误信息:"+res.errMsg)

        wx.showModal({

          title: '提示',

          content: res,

          showCancel: true,

          confirmText: '确定',

        })

      }

    })