Ajax下载文件

 var download = function (url) {
        $('<iframe></iframe>').css({
            display: 'none',
             0,
            height: 0
        }).attr('src', url).appendTo(document.body);
    };

调用方式

$.ajax({
                        url: 'http://localhost:8080/emp/order/exportExcel/1',
                        data: {"id": id},
                        success: function (data) {
                            download(data.url);
                        }
                    });