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exportExcel() {let dataNum = wx.getStorageSync('key'); //excel数据const data = dataNum;// 构建一个表的数据let sheet = [];let titles = ['测量次数'];//固定显示，可参考效果图let longestArray = data[0]; // 假设第一个数组是最长的，用于比较 let longestLength = longestArray.length;// 遍历数组集合，找出最长的数组 ,做标题for (let i = 1; i < data.length; i++) {if (data[i].length > longestLength) {longestArray = data[i];longestLength = data[i].length;}}longestArray.forEach((item, i) => {let title = '标题' + (i + 1);titles.push(title);})sheet.push(titles)data.forEach((item, ii) => {let content = [];let qqq = [ii + 1]; //列的次数let abc = item;content = [...qqq, ...abc]sheet.push(content);})// XLSX插件使用var ws = xlsx.utils.aoa_to_sheet(sheet);var wb = xlsx.utils.book_new();xlsx.utils.book_append_sheet(wb, ws, "测量");var fileData = xlsx.write(wb, {bookType: "xlsx",type: 'base64'});let filePath = `${wx.env.USER_DATA_PATH}/测量.xlsx`// 写文件const fs = wx.getFileSystemManager()fs.writeFile({filePath: filePath,data: fileData,encoding: 'base64',bookSST: true,success(res) {const sysInfo = wx.getSystemInfoSync()// 导出if (sysInfo.platform.toLowerCase().indexOf('windows') >= 0) {// 电脑PC端导出">