摘要：
最近有一个非项目的小需求，就是将项目开发分工文件化，方便后期管理维护。但是开发时，分工安排都是以json格式记录的，所以就做了一个将json数据以csv格式下载到本地。
代码：
<!DOCTYPE html> <html> <title>download csv</title> <head> <script src="http://code.jquery.com/jquery-1.11.0.min.js"></script> <script type="text/javascript" src="download.js"></script> </head> <body> <div align="center"> <h3><u>Enter JSON data</u></h3> <div class='mydiv'> <textarea id="txt" class='txtarea' rows="15" cols="100">[{"Vehicle":"BMW","Date":"30 Jul 2013 09:24 AM","Location":"Hauz Khas","Speed":42},{"Vehicle":"Honda CBR","Date":"30 Jul 2013 12:00 AM","Location":"Military Road","Speed":0},{"Vehicle":"Supra","Date":"30 Jul 2013 07:53 AM","Location":"Sec-45","Speed":58},{"Vehicle":"Land Cruiser","Date":"30 Jul 2013 09:35 AM","Location":"DLF Phase I","Speed":83}]</textarea> </div> <br/> <button class="download">Download CSV</button> </div> </body> </html>
download.js
$(document).ready(function() { "use strict"; var mo = { init: function() { $('.download').click(function() { var data = $('#txt').val(); if (data === '') { return; } mo.JSONToCSVConvertor(data, true); }); }, JSONToCSVConvertor: function(JSONData, ShowLabel) { var arrData = typeof JSONData !== 'object' ? JSON.parse(JSONData) : JSONData; var CSV = ''; if (ShowLabel) { var row = ""; for (var index in arrData[0]) { row += index + ','; } row = row.slice(0, -1); CSV += row + '\r\n'; } for (var i = 0; i < arrData.length; i++) { var row = ""; for (var index in arrData[i]) { var arrValue = arrData[i][index] == null ? "" : '="' + arrData[i][index] + '"'; row += arrValue + ','; } row.slice(0, row.length - 1); CSV += row + '\r\n'; } if (CSV == '') { growl.error("Invalid data"); return; } var fileName = "Result"; if (mo.msieversion()) { var IEwindow = window.open(); IEwindow.document.write('sep=,\r\n' + CSV); IEwindow.document.close(); IEwindow.document.execCommand('SaveAs', true, fileName + ".csv"); IEwindow.close(); } else { var uri = 'data:application/csv;charset=utf-8,' + escape(CSV); var link = document.createElement("a"); link.href = uri; link.style = "visibility:hidden"; link.download = fileName + ".csv"; document.body.appendChild(link); link.click(); document.body.removeChild(link); } }, msieversion: function() { var ua = window.navigator.userAgent; var msie = ua.indexOf("MSIE "); if (msie > 0 || !!navigator.userAgent.match(/Trident.*rv\:11\./)) // If Internet Explorer, return version number { return true; } else { // If another browser, return false; } return false; }, main: function() { mo.init(); } }; mo.main(); });
小结：
注意json格式[{},{}]，文件名是在js中定义的变量fileName。主要问题是他会自动添加一行空行，且每个元素都会在值前面加个'='。
下载下来的数据格式为：
