js保存到桌面功能

前言

/**
* [
*     saveToDesktop
*     IE:可以将数据写进文件并保存到桌面；
*     fireFox:可以选择路径将写进数据的文件保存；
*     chrome:只能保存到浏览器指定的下载目录下；
* ]
* @param  {[string]} fileName [文件名 如："test.txt"]
* @param  {[string]} data     [数据 如："username:key \r\n password:123456"]
*/
function saveToDesktop(fileName, data) {
var explorer = navigator.userAgent.toLowerCase();
if (explorer.indexOf("trident") > 0) {//IE 5+
var wss = new ActiveXObject("WScript.Shell");
var desktopUrl = wss.SpecialFolders("Desktop");
var fso = new ActiveXObject("Scripting.FileSystemObject");
var tf = fso.CreateTextFile(desktopUrl + "\\" + fileName, true);
tf.Write(data);
tf.Close();
} else {//fireFox chrome
var urlObj = window.URL || window.webkitURL || window;
var blob = new Blob([data]);
var link = document.createElementNS("http://www.w3.org/1999/xhtml", "a")
link.href = urlObj.createObjectURL(blob);
link.download = fileName;
saveClick(link);
}

function saveClick(obj) {
var e = document.createEvent("MouseEvents");
e.initMouseEvent(
"click", true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null
);
obj.dispatchEvent(e);
}
}