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：

巴特西

js将json数据以csv格式下载

摘要：

代码：

小结：

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