js post 下载文件

function DownLoadPost(url,data) {

    if (url && data) {
        var form = $('
{{ xsrf_form_html()|safe }}
');
        form.attr('action', url + "?rand=" + Math.random());
        form.attr('method', 'post');
        for (var item in data) {
        	console.log(data[item]);
            var input = $('');
            input.attr('name', item);
            input.attr('value', data[item]);
            form.append(input);
        }
        console.log(form.html());
        form.appendTo('body').submit().remove();
    };
}