transTempFileStream(Datastream, dir, id) { const cloud = require('wx-server-sdk') const fs = require('fs') const path = require('path') // var xlsx = require('node-xlsx'); let fileBase = Datastream[0].fileBase.data; let name = Datastream[0].name; let imgList = ['']; let ext = name.match(/\.[^.]+?$/)[0]; let rd = (Math.random() * (999999 - 100000 + 1) | 0) + 100000; //ccminiHelper.genRandomNum(100000, 999999); fs.writeFileSync(path.join(__dirname, name), fileBase, {   encoding: 'base64',   mode: 0o777   });   const file_content = fs.createReadStream(path.join(__dirname, name));     cloud.uploadFile({   cloudPath: dir + id + '_' + rd + ext,     fileContent: file_content,     }).then(res => { imgList[0] = res.fileID; }).catch(error => { console.log(error) }) return imgList; };