真机调试给腾讯云对象存储存图片正常 但是预览的就是上传失败 ，真机调试和预览都可以拿到临时密钥

afterRead(event) {

      console.log(event)

      var cos = new COS({

        getAuthorization: function (options, callback) {

          wx.request({

            url: 'http://192.168.101.26:8000/api/credential/',

            data: {

              // 可从 options 取需要的参数

            },

            success: function (result) {

              var data = result.data;

              var credentials = data.credentials;

              callback({

                TmpSecretId: credentials.tmpSecretId,

                TmpSecretKey: credentials.tmpSecretKey,

                XCosSecurityToken: credentials.sessionToken,

                ExpiredTime: data.expiredTime,

              });

            }

          });

        }

      });

      // 上传图片

      var that=this

      //获取随机文件名

      let randowString = Math.random().toString(36).slice(-8) + String(new Date().getTime());

      var fileKey = randowString ;

      cos.postObject({

        Bucket: 'chengxian-1303891317',

        Region: 'ap-nanjing',

        Key: fileKey+'.jpg',

        FilePath: event.detail.file.url,

        onProgress: function (info) {

        }

    }, function (err, data) {

      if (err) {

        console.log(err)

        wx.showToast({

          title: '上传失败',

          icon: 'none'

        });}else{

            that.setData({

              fileList:that.data.fileList.concat(event.detail.file)

          })

          that.data.coslist={}

          that.data.coslist.cos_path=data.headers.Location

          that.data.coslist.cos_name=fileKey+'.jpg'

          that.data.imageList.push(that.data.coslist)

          console.log(that.data.imageList)

        }

    });