我今天也遇到这个问题，然后改成import引入就可以了

wx.saveImageToPhotosAlbum 保存图片格式不对，保存图片为.xbm格式 [代码]wx.downloadFile({[代码][代码]          [代码][代码]url: baseImgUrl + [代码][代码]this[代码][代码].posterPath,[代码][代码]          [代码][代码]success: (res) => {[代码][代码]              [代码][代码]console.log(res.tempFilePath)[代码][代码]              [代码][代码]wx.saveImageToPhotosAlbum({[代码][代码]                [代码][代码]filePath: res.tempFilePath,[代码][代码]                [代码][代码]success: (res)=>{[代码][代码]                  [代码][代码]wx.showModal({[代码][代码]                    [代码][代码]title: [代码][代码]'保存成功'[代码][代码],[代码][代码]                    [代码][代码]content: [代码][代码]'成功保存到相册啦，快去分享吧！'[代码][代码],[代码][代码]                    [代码][代码]showCancel: [代码][代码]false[代码][代码],[代码][代码]                    [代码][代码]confirmText: [代码][代码]'好的'[代码][代码],[代码][代码]                    [代码][代码]confirmColor: [代码][代码]'#F43F00'[代码][代码],[代码][代码]                    [代码][代码]success: (res) =>{[代码][代码]                      [代码][代码]if[代码] [代码](res.confirm) {[代码][代码]                        [代码][代码]this[代码][代码].showShare = [代码][代码]false[代码][代码]                      [代码][代码]}[代码][代码]else[代码] [代码]{[代码][代码]                        [代码][代码]this[代码][代码].showShare = [代码][代码]true[代码][代码]                      [代码][代码]}[代码][代码]                    [代码][代码]},[代码][代码]                    [代码][代码]fail: (err) => {[代码][代码]                      [代码][代码]console.log(err)[代码][代码]                    [代码][代码]}[代码][代码]                  [代码][代码]})[代码][代码]                [代码][代码]}[代码][代码]              [代码][代码]})[代码][代码]          [代码][代码]}[代码][代码]        [代码][代码]})[代码]