angular导出文件保存在本地

$scope.ev_click = function(obj){
    var ev = document.createEvent("MouseEvents");
    ev.initMouseEvent("click", true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
    obj.dispatchEvent(ev);
}

$scope.export_add = function(name, data){
    var urlObject = window.URL || window.webkitURL || window;
    var export_blob = new Blob([data], {type: "Multipart/form-data"});
    var save_link = document.createElementNS("http://www.w3.org/1999/xhtml", "a")
    save_link.href = urlObject.createObjectURL(export_blob);
    save_link.download = name;
    $scope.ev_click(save_link);
}