Download Files Using Javascripts for Different Types of Browser

$scope.downloadDocument = function()
{
    // Here we are passing URL from where we are going to download file to browser
    var documentUrl =
    {
        'FileName': $scope.selectedRow[0].Url
    };
    // following  method will give call to javascript method
    Download($scope.selectedRow[0].Url)
};

function Download(url)
{
    // Here we identifying browser
    var isOpera = !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;

    var isFirefox = typeof InstallTrigger !== 'undefined';

    var isSafari = Object.prototype.toString.call(window.HTMLElement).indexOf('Constructor') > 0;

    var isChrome = !!window.chrome && !isOpera;

    var isIE = /*@cc_on!@*/ false || !!document.documentMode;

    if (isChrome || isFirefox)
    {
        var save = document.createElement('a');
        save.href = url;
        save.target = '_blank';
        save.download = $scope.selectedRows[0].Name;
        var evt = document.createEvent('MouseEvents');
        evt.initMouseEvent('click', true, true, window, 1, 0, 0, 0, 0,
            false, false, false, false, 0, null);
        save.dispatchEvent(evt);
        (window.URL || window.webkitURL).revokeObjectURL(save.href);
    }
    if (isIE) {
        // Force downloading of pdf files (it will NEVER allow any browser specific pdf-reader to render/open your pdf files):                              var _window = window.open(fileURL, '_blank');

        //  To force downloading pdf uncomment following line of code and comment above line
        //  var _window = window.open(url, '', 'left=10000,screenX=10000')
        _window.document.close();
        _window.document.execCommand('SaveAs', null, url)
        _window.close();
    }
};