微信小程序下载后端返回的文件流

			downtest() {let temp = {"title": ["排名", "车号", "车队", "车手", "领航", "赛段成绩", "距首车成绩", "距前车差距", "发车时间", "冲刺时间", "赛段用时", "罚时","补时"],"value": [[1, "111", "重庆拉力车队", "钟川", "张铮", "00时49分59秒0毫秒", "-", "-", "10点20分10秒8毫秒", "11点10分09秒9毫秒","00时49分59秒0毫秒", "00时00分10秒8毫秒", "", "https://wei.ltd.com/assets/images/no-image.jpg"],[2, "1", "浙江同联拉力车队", "徐俊", "朱盛平", "01时00分00秒0毫秒", "00时00分11秒0毫秒", "00时00分11秒0毫秒","10点10分10秒8毫秒", "11点10分10秒8毫秒", "01时00分00秒0毫秒", "", "","https://wei.ltd.com/assets/images/no-image.jpg"],[3, "666", "66", "666", "66", "01时04分51秒0毫秒", "00时00分15秒0毫秒", "00时00分04秒0毫秒","10点20分10秒8毫秒", "11点25分01秒8毫秒", "01时04分51秒0毫秒", "", "","https://wei.ltd.com/assets/images/no-image.jpg"],[4, "123", "方格旗", "眼泪", "泡泡", "04时00分59秒0毫秒", "00时03分11秒0毫秒", "00时02分56秒0毫秒","8点48分00秒0毫秒", "12点48分59秒789毫秒", "04时00分59秒0毫秒", "", "","https://static.ltdcdn.com/uploadfilev2/image/0/501/261/2023-08/16927686744833.png"]]}let obj = {file_name: 'ces',data: JSON.stringify(temp)}let header = {// #ifdef MP-WEIXIN"User-Agen": 'miniProgram',// #endif// #ifdef H5"User-Agen": 'h5',// #endif}uni.request({url: `请求url`,header: header,method: 'post',responseType: "arraybuffer",data: obj,success: (res) => {let temp = res.statusCode == 200 ? res.data : resconst fs = wx.getFileSystemManager(); //获取全局唯一的文件管理器 fs.writeFile({ //写文件filePath: wx.env.USER_DATA_PATH +"/统计报表.xlsx",data: temp, // res.data就是获取到的二进制文件流encoding: "binary", //二进制流文件必须是 binarysuccess(e) {wx.openDocument({ // 打开文档filePath: wx.env.USER_DATA_PATH +"/统计报表.xlsx", //拿上面存入的文件路径showMenu: true, // 显示右上角菜单success: function(x) {console.log("successfun", x);},})},fail: (err) => {// 文件下载失败的相关处理console.log('download fail', err);}})}})},

responseType: "arraybuffer",  请求后端的二进制文件流 必须要加这段声明 ，否则会导致下载的文件打不开或者打开空白