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);
         }
     }