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，在谷歌还是找到答案了，下载链接在此。

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 = document.createElement('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 (document.createEvent) {
var e = document.createEvent('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 = navigator.userAgent.toLowerCase().indexOf('chrome') > -1;
window.downloadFile.isSafari = navigator.userAgent.toLowerCase().indexOf('safari') > -1;