js调用浏览器下载

 $scope.Download = function (url) {
            var save_link = document.createElementNS("http://www.w3.org/1999/xhtml", "a");
            //地址
            save_link.href = url;
            save_link.download = name;
            var ev = document.createEvent("MouseEvents");
            ev.initMouseEvent(
                "click", true, false, window, 0, 0, 0, 0, 0
                , false, false, false, false, 0, null
            );
            save_link.dispatchEvent(ev);
        }
    }