ajax导出excel文件并增加等待动画效果

html：

　　<button class="btn btn-default" onclick="logToExcel('{:url('userLogToExcel',['day' => '3'])}')">3天日志导出</button>

js:

function logToExcel(url){
    $('.masking').show();
    $.ajax({
        url:url,
        type:"post",
        processData : false,
        contentType : false ,
        success:function (data) {
            if(data.result){
                var form=$("<form>");//定义一个form表单
                form.attr("style","display:none");
                form.attr("target","");
                form.attr("method","post");
                form.attr("action",data.data);//请求地址
                $("body").append(form);//将表单放置在web中
                //传递参数
                var input1 = $("<input>");
                input1.attr("type", "hidden");
                input1.attr("name", "fileName");
                input1.attr("value", data.fileName);
                form.append(input1);

                var input2 = $("<input>");
                input2.attr("type", "hidden");
                input2.attr("name", "fileDir");
                input2.attr("value", data.fileDir);
                form.append(input2);

                form.submit().remove();//表单提交
                $('.masking').hide();
            }else{
                alert(data.msg);
            }
        }
    })
}

php:

/**
 * 用户操作日志导出Excel表
 * @internal param int $day 导出日志时间
 * @return \think\response\Json
 * @reviewer
 */
public function userLogToExcel(){
    set_time_limit(0);
    $time = date('Y-m-d',time());
    $fileName = 'userlog-' . $time;
    $day = Request::instance()->param('day');
    //$day = input('day');
    if ($day == '7'){
        $start_time = strtotime('-7 day');
    }else{
        $start_time = strtotime('-3 day');
    }
    $startTime = date('Y-m-d',$start_time);
    $endTime = date('Y-m-d H:i:s',time());
    $userID = '';
    $firstRow = '';
    $listRows = '';
    $logUser = new UserLog();
    $list = $logUser->getLogList($userID,$startTime,$endTime,$firstRow, $listRows);
    $listID = array();
    foreach ($list as $k => $v){
        $listID[$k] = $v['user_id'];
    }
    $listId = array_unique($listID);
    $userDetail = new UserInfo();
    $userData = $userDetail->getUserInfo($listId);
    $userInfo = [];
    foreach ($userData as $key => $value){
        $userInfo[$value['user_id']] = $value;
    }
    $taskData = [];
    foreach ($list as $k => $v){
                $taskData[$k] = [
                    $k+1,
                    $userInfo[$v['user_id']]['user_name'],
                    $userInfo[$v['user_id']]['real_name'],
                    $v['log_info'],
                    $v['log_ip'],
                    $v['log_area'],
                    $v['log_url'],
                    $v['log_time'],
                ];
    }
    $taskNewData = ['序号', '用户名', '真实名', '操作信息', 'ip地址', '登陆地', '操作url','操作时间'];
    array_unshift($taskData, $taskNewData);
    $filePath = ROOT_PATH . 'public' . DS . 'static' . DS . 'file' . DS . 'tmp' . DS;

    try{
        Excel::generateExcel($fileName, $taskData, false, $filePath);
    }catch (\Exception $e){
        return json(['result' => false, 'msg' => '日志导出失败']);
    }
    return json(['result' => true, 'fileName' => $fileName.'.xlsx', 'fileDir' => $filePath, 'data' => '/admin/log_user/sendFile']);
}

/**
 * 将服务器文件发送到浏览器
 * @internal param $fileDir 文件路径
 * @internal param $fileName 文件名称
 * @return Excel
 */
public function sendFile()
{
    $fileDir = Request::instance()->param('fileDir');
    $fileName = Request::instance()->param('fileName');
    $fileName = iconv('gbk','utf-8', $fileName);
    //检查文件是否存在
    if (!file_exists($fileDir . $fileName)) {
        echo "<meta http-equiv='refresh' content='3; url={$_SERVER['HTTP_REFERER']}'>";
        echo "文件不存在";
        exit();
    } else {
        //打开文件
        $file = fopen($fileDir . $fileName, "r");
        //输入文件标签
        Header("Content-type: application/octet-stream");
        Header("Accept-Ranges: bytes");
        Header("Accept-Length: " . filesize($fileDir . $fileName));
        Header("Content-Disposition: attachment; filename=" . $fileName);
        //输出文件内容
        //读取文件内容并直接输出到浏览器
        echo fread($file, filesize($fileDir . $fileName));
        fclose($file);
        exit();
    }
}