Js下载⽂件到本地（兼容多浏览器）
在客户端通过js下载⽂件，试过⼏种下载⽅式，iframe⽅式仅限于IE浏览器，window.open(url)，location.href=url 这两种⽅式在chrome浏览器还会是直接打开⽂件⽽不是下载，百度N久没有结果，在⾕歌还是到答案了，在此。
window.downloadFile = function (sUrl) {
//iOS devices do not support downloading. We have to inform user about this.
if (/(iP)/g.test(navigator.userAgent)) {
alert('Your device does not support files downloading. Please try again in desktop browser.');
return false;
}
//If in Chrome or Safari - download via virtual link click
if (window.downloadFile.isChrome || window.downloadFile.isSafari) {
//Creating new link node.
var link = ateElement('a');
link.href = sUrl;
if (link.download !== undefined) {
//Set HTML5 download attribute. This will prevent file from opening if supported.
var fileName = sUrl.substring(sUrl.lastIndexOf('/') + 1, sUrl.length);
link.download = fileName;
}
//Dispatching click event.
if (ateEvent) {
var e = ateEvent('MouseEvents');
e.initEvent('click', true, true);
link.dispatchEvent(e);
return true;
}
}
// Force file download (whether supported by server).
if (sUrl.indexOf('?') === -1) {
sUrl += '?download';
}
window.open(sUrl, '_self');
return true;
}
window.downloadFile.isChrome = LowerCase().indexOf('chrome') > -1;
chrome直接下载window.downloadFile.isSafari = LowerCase().indexOf('safari') > -1;

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