// 下载预览文件onSaveClick: function (e) {let _this = this;let path = e.currentTarget.dataset.path;wx.showLoading({title: '下载中...',})var filename = new Date().getTime() + ".jpg";var savePath = wx.env.USER_DATA_PATH + "/" + filenamewx.downloadFile({header: 'content-type: image/jpg',url: path,filePath: savePath,success: function (res) {wx.hideLoading({success: (res) => {},})var filePath = res.filePath_this.setData({filePath: filePath})wx.getSetting({success: (res) => {console.log('getSetting', res);var writePhotosAlbum = res.authSetting['scope.writePhotosAlbum'];if (writePhotosAlbum == true) {_this.saveImg()} else if (writePhotosAlbum == false) {wx.showModal({title: '是否授权保存到相册',content: '需要获取您的保存图片权限，请确认授权，否则图片将无法保存到相册',success: function (tip) {if (tip.confirm) {wx.openSetting({success: function (data) {if (data.authSetting["scope.writePhotosAlbum"] === true) {_this.saveImg()} else {wx.showToast({title: '授权失败',})}}})}}})} else {_this.saveImg()}},fail: function (res) {},complete: () => {}})}})},saveImg: function () {var filePath = this.data.filePathwx.showLoading({title: '保存中...',})wx.saveImageToPhotosAlbum({filePath: filePath,success: function (res) {wx.hideLoading({success: (res) => {},})wx.showToast({title: '保存成功',icon: 'success',duration: 1500,})},fail: function (res) {wx.showToast({title: "保存失败：" + res.errMsg,icon: 'none',duration: 1500,})},complete: function (res) {},})},