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：
[url=http://code.jquery.com/jquery-1.11.0.min.js"></script]http://code.jquery.com/jquery-1.11.0.min.js"></script[/url]>
<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：
[img]http://files.jb51.net/file_images/article/201501/201501091043002.png[/img]
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