由于项目中会用到一个文件的下载功能，所以查找了各种论坛，找到两篇很好用的下载方式，1.通过获取json数据下载为csv文件2.将Table表格下载为excel文件。
代码来源（代码全部来源于以下两篇博客）
https://blog.csdn.net/qq_38951418/article/details/88057016
获取json数据下载为csv文件
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <button onclick=‘tableToExcel()‘>导出</button> </body> </html> <script> function tableToExcel(){ //要导出的json数据 var jsonData = [ { name:‘李四‘, phone:‘1777829****‘, email:‘20838****@qq.com‘ }, { name:‘张三‘, phone:‘1777829****‘, email:‘20838****@qq.com‘ }, { name:‘王五‘, phone:‘1777829****‘, email:‘20838****@qq.com‘ }, { name:‘老刘‘, phone:‘1777829****‘, email:‘20838****@qq.com‘ } ] //列标题，逗号隔开，每一个逗号就是隔开一个单元格 let str = `姓名,电话,邮箱\n`; //增加\t为了不让表格显示科学计数法或者其他格式 for(let i = 0 ; i < jsonData.length ; i++ ){ for(let item in jsonData[i]){ str+=`${jsonData[i][item] + ‘\t‘},`; } str+=‘\n‘; } //encodeURIComponent解决中文乱码 let uri = ‘data:text/csv;charset=utf-8,\ufeff‘ + encodeURIComponent(str); //通过创建a标签实现 var link = document.createElement("a"); link.href = uri; //对下载的文件命名 link.download = "json数据表.csv"; document.body.appendChild(link); link.click(); document.body.removeChild(link); } </script>
将Table数据下载为Excel表格
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Table2Excel</title> <script type="text/javascript" src="table2excel.js"></script> </head> <body> <table id="tableid" border="1"> <tr><td>你好</td><td>12</td><td>12</td><td>12</td><td>12</td></tr> <tr><td>你</td><td>12</td><td>12</td><td>12</td><td>12</td></tr> <tr><td>12</td><td>12</td><td>12</td><td>12</td><td>12</td></tr> <tr><td>12</td><td>12</td><td>12</td><td>12</td><td>12</td></tr> <tr><td>12</td><td>12</td><td>12</td><td>12</td><td>12</td></tr> <tr><td>12</td><td>12</td><td>12</td><td>12</td><td>12</td></tr> </table> <button onclick="toexcel()">下载Excel</button> <script type="text/javascript"> var tableId = document.getElementById(‘tableid‘); function toexcel() { methodtable2excel(tableId); } /* Table 生成 Excel */ var idTmr; function getExplorer() { var explorer = window.navigator.userAgent ; //ie if (explorer.indexOf("MSIE") >= 0) { return ‘ie‘; } //firefox else if (explorer.indexOf("Firefox") >= 0) { return ‘Firefox‘; } //Chrome else if(explorer.indexOf("Chrome") >= 0){ return ‘Chrome‘; } //Opera else if(explorer.indexOf("Opera") >= 0){ return ‘Opera‘; } //Safari else if(explorer.indexOf("Safari") >= 0){ return ‘Safari‘; } } function methodtable2excel(tableid) {//整个表格拷贝到EXCEL中 if(getExplorer()==‘ie‘) { var curTbl = document.getElementById(tableid); var oXL = new ActiveXObject("Excel.Application");//创建AX对象excel var oWB = oXL.Workbooks.Add();//获取workbook对象 var xlsheet = oWB.Worksheets(1);//激活当前sheet var sel = document.body.createTextRange(); sel.moveToElementText(curTbl);//把表格中的内容移到TextRange中 sel.select();//全选TextRange中内容 sel.execCommand("Copy");//复制TextRange中内容 xlsheet.Paste();//粘贴到活动的EXCEL中 oXL.Visible = true;//设置excel可见属性 try { var fname = oXL.Application.GetSaveAsFilename("Excel.xls", "Excel Spreadsheets (*.xls), *.xls"); } catch (e) { print("Nested catch caught " + e); } finally { oWB.SaveAs(fname); oWB.Close(savechanges = false); //xls.visible = false; oXL.Quit(); oXL = null; //结束excel进程，退出完成 //window.setInterval("Cleanup();",1); idTmr = window.setInterval("Cleanup();", 1); } } else { tableToExcel(tableid); } } function Cleanup() { window.clearInterval(idTmr); CollectGarbage(); } var tableToExcel = (function() { var uri = ‘data:application/vnd.ms-excel;base64,‘, template = ‘<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40"><head><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet><x:Name>{worksheet}</x:Name><x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]--><meta charset="UTF-8"></head><body><table>{table}</table></body></html>‘, base64 = function(s) { return window.btoa(unescape(encodeURIComponent(s))) }, format = function(s, c) { return s.replace(/{(\w+)}/g, function(m, p) { return c[p]; }) }; return function(table, name) { if (!table.nodeType) table = document.getElementById(table); var ctx = {worksheet: name || ‘Worksheet‘, table: table.innerHTML}; window.location.href = uri + base64(format(template, ctx)) } })(); </script> </body> </html>