return new Promise(function(resolve, reject) {

        wx.downloadFile({

            url: conf.url + `${url}${data ? "?" + JSON.stringify(data) : ""}`,

            header: {

                'Cookie': 'JSESSIONID=' + getApp().globalData.jsessionid

            },

            success: function(res) {

                if (res.statusCode === 200) {

                    console.log(res);

                    wx.saveFile({

                    tempFilePath: res.tempFilePath,

                    success(res){

                        console.log(res);

                        wx.openDocument({

                            filePath: res.savedFilePath,

                            success: function (res) {

                                console.log('打开文档成功')